[bug] Bot keeps adding the awaiting reviews label

[dhruvmanila]

GitHub event:

• pull_request:opened
• pull_request:synchronize
• pull_request:ready_for_review
• pull_request:closed
• pull_request:labeled
• pull_request:unlabeled
• pull_request_review:submitted
• check_run:completed
• issues:opened

Example pull request/issue:

TheAlgorithms/Python#3420

Steps to reproduce the bug:

• Pull request has been opened, no errors found, and all tests passed => bot adds the awaiting reviews label
• Then a maintainer approves the pull request and tries to remove the label awaiting reviews but the bot adds it back as it still thinks the review is pending.

Proposal:

The solution would be to remove the awaiting reviews label when a pull request has been approved and not add it back on the pull_request:unlabeled event.

The above example is a rare case because the bot was not installed when the pull request was opened, thus the bot did not add awaiting reviews label and so it thought the review was still pending.