[MOB-9322] Merge Release CI Jobs Together

[TheBuggedYRN]

Description of the change

Back in #98, a separate release job for pub was added, because Escape could no longer authenticate to pub. The authentication failure was due to this change in pub: dart-lang/pub#2999.

This PR aims at merging back the two release jobs (pub_release & gh_ibg_release) into one new job (release), that uses the latest fix from Instabug/Escape#58.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Issue links go here

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests

Code review

• This pull request has a descriptive title and information useful to a reviewer
• Issue from task tracker has a link to this pull request

[codecov]

Codecov Report

Merging #282 (10f5ff6) into master (dfd7e52) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #282   +/-   ##
=======================================
  Coverage   81.84%   81.84%           
=======================================
  Files          17       17           
  Lines         369      369           
=======================================
  Hits          302      302           
  Misses         67       67           

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