Cancel workflows when pr is force merged/closed

[yhmo]

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[sre-ci-robot]

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This pull-request has been approved by: yhmo

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• OWNERS [yhmo]

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[Copilot]

Pull request overview

This PR extends the existing “cleanup PR caches” workflow so that when a pull request is closed it also attempts to cancel still-running GitHub Actions workflow runs associated with that PR, in addition to deleting PR-scoped caches.

Changes:

• Add a “Cancel PR workflow runs” step to cancel queued/in-progress PR workflow runs when a PR is closed.
• Rename the cleanup job to reflect broader “actions state” cleanup (runs + caches).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.75%. Comparing base (a0592aa) to head (db31754).
⚠️ Report is 107 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #508       +/-   ##
===========================================
+ Coverage   53.47%   77.75%   +24.27%     
===========================================
  Files          52      304      +252     
  Lines        4432    13654     +9222     
  Branches        0     1325     +1325     
===========================================
+ Hits         2370    10616     +8246     
- Misses       2062     2929      +867     
- Partials        0      109      +109     

see 321 files with indirect coverage changes

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