feat: remove obsolete labels on pr close

[navinkarkera]

Removes obsolete labels from pull requests when it is merged or closed.

Related to: openedx/wg-coordination#150

Private-ref: FAL-4026

Test instructions:

• Set GITHUB_PERSONAL_TOKEN=<your_token> and GITHUB_OSPR_PROJECT="openedx:19" environment variables.
• Select a closed PR to test, you can use my PR
• Add some labels to PR like: blocked by other work, needs reviewer assigned etc.
• Get PR json using github cli, for example,

gh api \
  -H "Accept: application/vnd.github+json" \
  -H "X-GitHub-Api-Version: 2022-11-28" \
  /repos/openedx/openedx-webhooks/pulls/327 > /tmp/some.json

• Update following lines in openedx_webhooks/tasks/pr_tracking.py to make the process faster.

Line 212 in `desired_support_state` function.
-    is_internal = is_internal_pull_request(pr)
+    is_internal = False

Line 268 in `desired_support_state` function.
-    has_signed_agreement = pull_request_has_cla(pr)
+    has_signed_agreement = True

• Add below snippet to openedx_webhooks/tasks/github.py file and execute it.

if __name__ == '__main__':
    import json
    with open('/tmp/some.json') as f:
        pr = json.load(f)
    pull_request_changed(pr)

• This should remove the labels listed in GITHUB_MERGED_PR_OBSOLETE_LABELS and GITHUB_CLOSED_PR_OBSOLETE_LABELS variables.

[openedx-webhooks]

Thanks for the pull request, @navinkarkera!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.72%. Comparing base (97350f9) to head (4401cf3).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #335      +/-   ##
==========================================
+ Coverage   89.53%   89.72%   +0.19%     
==========================================
  Files          38       38              
  Lines        3009     3026      +17     
  Branches      227      229       +2     
==========================================
+ Hits         2694     2715      +21     
+ Misses        283      279       -4     
  Partials       32       32              

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