Add GHA annotations for phpcs-changed output

[ockham]

No description provided.

[github-actions]

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Props bernhard-reiter.

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[ockham]

Looks like it's working 🎉 With 5ba49e9 applied:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.93%. Comparing base (8b53724) to head (fabddb1).
⚠️ Report is 2 commits behind head on trunk.

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk     #372      +/-   ##
============================================
- Coverage     53.65%   51.93%   -1.73%     
  Complexity     4410     4410              
============================================
  Files           298      298              
  Lines         39424    39424              
============================================
- Hits          21154    20475     -679     
- Misses        18270    18949     +679     

Flag	Coverage Δ
e2e-js	44.95% <ø> (-0.79%)	⬇️
e2e-php	39.74% <ø> (-2.33%)	⬇️
javascript	15.07% <ø> (ø)
phpunit	29.97% <ø> (ø)

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