Fix ListWorkflowRuns OpenAPI response model.

[ScionOfDesign]

Change the OpenAPI response of ListWorkflowRuns to WorkflowRunsList like it is supposed to be.

[ScionOfDesign]

Hold off for a bit, I just encountered another error when actually trying to deserialize this endpoint to WorkflowRunsList.

[ScionOfDesign]

It's odd, in the response both licenses and repo_transfer are being returned as null, but they are required in the OpenAPI spec:

        "has_wiki": true,
        "has_pull_requests": true,
        "has_projects": true,
        "projects_mode": "all",
        "has_releases": true,
        "has_packages": true,
        "has_actions": true,
        "ignore_whitespace_conflicts": false,
        "allow_merge_commits": true,
        "allow_rebase": true,
        "allow_rebase_explicit": true,
        "allow_squash_merge": true,
        "allow_fast_forward_only_merge": true,
        "allow_rebase_update": true,
        "allow_manual_merge": false,
        "autodetect_manual_merge": false,
        "default_delete_branch_after_merge": false,
        "default_merge_style": "merge",
        "default_allow_maintainer_edit": false,
        "avatar_url": "",
        "internal": false,
        "mirror_interval": "",
        "object_format_name": "sha1",
        "mirror_updated": "0001-01-01T00:00:00Z",
        "repo_transfer": null,
        "topics": [],
        "licenses": null

[ScionOfDesign]

Fixed the model to omit null (but not nullable) values and initialize the Licenses array in the response even if they are empty.

[ScionOfDesign]

Forgot that the original didn't have the pre-allocation. Your suggestion should be ideal.

[wxiaoguang]

Forgot that the original didn't have the pre-allocation. Your suggestion should be ideal.

For performance-critical code, that if and pre-allocation does help.

While here I think we can keep StringList as simple as before. TBH I think in this case there should be no noticeable difference, while simple code reads better.

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(I just meant that in the convert function, we can't depend on the StringList's behavior)