Try to use less fields for the payloads in order to avoid parsing errors

[joao-paulo-parity]

The bot got stuck in paritytech/polkadot#2990 due to a parsing error from a commit status:

{"severity":"INFO","message":"Ignoring payload parsing error","timestamp":"2021-05-27T14:21:42.756882005Z"}

Apparently the JSON payload is fine, which means the serde deserialization failed on our side for some reason.

JSON

{"id":13248674710,"sha":"d37101e9c48af97596dd334cfe8ee84af4d38a94","name":"paritytech/polkadot","target_url":null,"avatar_url":"https://avatars.githubusercontent.com/in/110390?v=4","context":"cla","description":null,"state":"success","commit":{"sha":"d37101e9c48af97596dd334cfe8ee84af4d38a94","node_id":"MDY6Q29tbWl0MTQ0MTQwMzQyOmQzNzEwMWU5YzQ4YWY5NzU5NmRkMzM0Y2ZlOGVlODRhZjRkMzhhOTQ=","commit":{"author":{"name":"parity-processbot","email":"","date":"2021-05-27T12:55:53Z"},"committer":{"name":"parity-processbot","email":"","date":"2021-05-27T12:55:53Z"},"message":"update Substrate","tree":{"sha":"a160ce86b19dcfbfd23ef6db58ca4f85d8679705","url":"https://api.github.com/repos/paritytech/polkadot/git/trees/a160ce86b19dcfbfd23ef6db58ca4f85d8679705"},"url":"https://api.github.com/repos/paritytech/polkadot/git/commits/d37101e9c48af97596dd334cfe8ee84af4d38a94","comment_count":0,"verification":{"verified":false,"reason":"unsigned","signature":null,"payload":null}},"url":"https://api.github.com/repos/paritytech/polkadot/commits/d37101e9c48af97596dd334cfe8ee84af4d38a94","html_url":"https://github.com/paritytech/polkadot/commit/d37101e9c48af97596dd334cfe8ee84af4d38a94","comments_url":"https://api.github.com/repos/paritytech/polkadot/commits/d37101e9c48af97596dd334cfe8ee84af4d38a94/comments","author":{},"committer":{},"parents":[{"sha":"f46d23ded73938ba661815a9a852cb62769914eb","url":"https://api.github.com/repos/paritytech/polkadot/commits/f46d23ded73938ba661815a9a852cb62769914eb","html_url":"https://github.com/paritytech/polkadot/commit/f46d23ded73938ba661815a9a852cb62769914eb"}]},"branches":[{"name":"kpp-companion-8748","commit":{"sha":"d37101e9c48af97596dd334cfe8ee84af4d38a94","url":"https://api.github.com/repos/paritytech/polkadot/commits/d37101e9c48af97596dd334cfe8ee84af4d38a94"},"protected":false}],"created_at":"2021-05-27T14:21:42+00:00","updated_at":"2021-05-27T14:21:42+00:00","repository":{"id":144140342,"node_id":"MDEwOlJlcG9zaXRvcnkxNDQxNDAzNDI=","name":"polkadot","full_name":"paritytech/polkadot","private":false,"owner":{"login":"paritytech","id":14176906,"node_id":"MDEyOk9yZ2FuaXphdGlvbjE0MTc2OTA2","avatar_url":"https://avatars.githubusercontent.com/u/14176906?v=4","gravatar_id":"","url":"https://api.github.com/users/paritytech","html_url":"https://github.com/paritytech","followers_url":"https://api.github.com/users/paritytech/followers","following_url":"https://api.github.com/users/paritytech/following{/other_user}","gists_url":"https://api.github.com/users/paritytech/gists{/gist_id}","starred_url":"https://api.github.com/users/paritytech/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/paritytech/subscriptions","organizations_url":"https://api.github.com/users/paritytech/orgs","repos_url":"https://api.github.com/users/paritytech/repos","events_url":"https://api.github.com/users/paritytech/events{/privacy}","received_events_url":"https://api.github.com/users/paritytech/received_events","type":"Organization","site_admin":false},"html_url":"https://github.com/paritytech/polkadot","description":"Polkadot Node Implementation","fork":false,"url":"https://api.github.com/repos/paritytech/polkadot","forks_url":"https://api.github.com/repos/paritytech/polkadot/forks","keys_url":"https://api.github.com/repos/paritytech/polkadot/keys{/key_id}","collaborators_url":"https://api.github.com/repos/paritytech/polkadot/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/paritytech/polkadot/teams","hooks_url":"https://api.github.com/repos/paritytech/polkadot/hooks","issue_events_url":"https://api.github.com/repos/paritytech/polkadot/issues/events{/number}","events_url":"https://api.github.com/repos/paritytech/polkadot/events","assignees_url":"https://api.github.com/repos/paritytech/polkadot/assignees{/user}","branches_url":"https://api.github.com/repos/paritytech/polkadot/branches{/branch}","tags_url":"https://api.github.com/repos/paritytech/polkadot/tags","blobs_url":"https://api.github.com/repos/paritytech/polkadot/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/paritytech/polkadot/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/paritytech/polkadot/git/refs{/sha}","trees_url":"https://api.github.com/repos/paritytech/polkadot/git/trees{/sha}","statuses_url":"https://api.github.com/repos/paritytech/polkadot/statuses/{sha}","languages_url":"https://api.github.com/repos/paritytech/polkadot/languages","stargazers_url":"https://api.github.com/repos/paritytech/polkadot/stargazers","contributors_url":"https://api.github.com/repos/paritytech/polkadot/contributors","subscribers_url":"https://api.github.com/repos/paritytech/polkadot/subscribers","subscription_url":"https://api.github.com/repos/paritytech/polkadot/subscription","commits_url":"https://api.github.com/repos/paritytech/polkadot/commits{/sha}","git_commits_url":"https://api.github.com/repos/paritytech/polkadot/git/commits{/sha}","comments_url":"https://api.github.com/repos/paritytech/polkadot/comments{/number}","issue_comment_url":"https://api.github.com/repos/paritytech/polkadot/issues/comments{/number}","contents_url":"https://api.github.com/repos/paritytech/polkadot/contents/{+path}","compare_url":"https://api.github.com/repos/paritytech/polkadot/compare/{base}...{head}","merges_url":"https://api.github.com/repos/paritytech/polkadot/merges","archive_url":"https://api.github.com/repos/paritytech/polkadot/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/paritytech/polkadot/downloads","issues_url":"https://api.github.com/repos/paritytech/polkadot/issues{/number}","pulls_url":"https://api.github.com/repos/paritytech/polkadot/pulls{/number}","milestones_url":"https://api.github.com/repos/paritytech/polkadot/milestones{/number}","notifications_url":"https://api.github.com/repos/paritytech/polkadot/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/paritytech/polkadot/labels{/name}","releases_url":"https://api.github.com/repos/paritytech/polkadot/releases{/id}","deployments_url":"https://api.github.com/repos/paritytech/polkadot/deployments","created_at":"2018-08-09T10:57:23Z","updated_at":"2021-05-27T13:02:35Z","pushed_at":"2021-05-27T14:13:55Z","git_url":"git://github.com/paritytech/polkadot.git","ssh_url":"[email protected]:paritytech/polkadot.git","clone_url":"https://github.com/paritytech/polkadot.git","svn_url":"https://github.com/paritytech/polkadot","homepage":"","size":94384,"stargazers_count":3523,"watchers_count":3523,"language":"Rust","has_issues":true,"has_projects":true,"has_downloads":true,"has_wiki":true,"has_pages":false,"forks_count":720,"mirror_url":null,"archived":false,"disabled":false,"open_issues_count":288,"license":{"key":"gpl-3.0","name":"GNU General Public License v3.0","spdx_id":"GPL-3.0","url":"https://api.github.com/licenses/gpl-3.0","node_id":"MDc6TGljZW5zZTk="},"forks":720,"open_issues":288,"watchers":3523,"default_branch":"master"},"organization":{"login":"paritytech","id":14176906,"node_id":"MDEyOk9yZ2FuaXphdGlvbjE0MTc2OTA2","url":"https://api.github.com/orgs/paritytech","repos_url":"https://api.github.com/orgs/paritytech/repos","events_url":"https://api.github.com/orgs/paritytech/events","hooks_url":"https://api.github.com/orgs/paritytech/hooks","issues_url":"https://api.github.com/orgs/paritytech/issues","members_url":"https://api.github.com/orgs/paritytech/members{/member}","public_members_url":"https://api.github.com/orgs/paritytech/public_members{/member}","avatar_url":"https://avatars.githubusercontent.com/u/14176906?v=4","description":"Solutions for a trust-free world"},"sender":{"login":"cla-bot-2021[bot]","id":82517672,"node_id":"MDM6Qm90ODI1MTc2NzI=","avatar_url":"https://avatars.githubusercontent.com/in/110390?v=4","gravatar_id":"","url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D","html_url":"https://github.com/apps/cla-bot-2021","followers_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/followers","following_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/following{/other_user}","gists_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/gists{/gist_id}","starred_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/subscriptions","organizations_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/orgs","repos_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/repos","events_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/events{/privacy}","received_events_url":"https://api.github.com/users/cla-bot-2021%5Bbot%5D/received_events","type":"Bot","site_admin":false},"installation":{"id":6784676,"node_id":"MDIzOkludGVncmF0aW9uSW5zdGFsbGF0aW9uNjc4NDY3Ng=="}}

To counteract that, trim down the JSON variants and fields as much as possible in order to not run into parsing errors anymore.