Infrastructure: Replace styfle/cancel-workflow-action with native concurrency

[westonruter]

Summary

• Replaces styfle/cancel-workflow-action with GitHub Actions' built-in concurrency feature in php-lint.yml, php-test-plugins.yml, and js-lint.yml.
• Drops the actions: write permission those jobs needed only for the third-party action.
• Concurrency group pattern matches the existing one in .github/workflows/codeql-analysis.yml.

Follows up on @thelovekesh's review feedback in #2471 (comment).

Test plan

• Push a follow-up commit to this PR and verify the prior in-progress workflow run is cancelled (visible in the Actions tab).
• Confirm the three workflows still complete successfully on this PR.

🤖 Generated with Claude Code

[github-actions]

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Co-authored-by: westonruter <westonruter@git.wordpress.org>
Co-authored-by: thelovekesh <thelovekesh@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.33%. Comparing base (e625c7c) to head (9fa4c1f).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2472   +/-   ##
=======================================
  Coverage   69.33%   69.33%           
=======================================
  Files          90       90           
  Lines        7749     7749           
=======================================
  Hits         5373     5373           
  Misses       2376     2376           

Flag	Coverage Δ
multisite	69.33% <ø> (ø)
single	35.73% <ø> (ø)

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