Update Build, test & measure workflow

[thelovekesh]

Summary

• Remove generate-changelog script and draft-release action.
• Decouple the following jobs as re-usable composite workflows:
  • Setup Node and NPM: Setup Node/NPM; Installs and caches dependencies.
  • Setup PHP and Composer: Setup PHP/Composer; Installs and cache dependencies;
  • Determine modified files; Determine modified file counts; Add GitHub workflow summary
  • Build Plugin: Build plugin assets and cache them if the package-lock.json and files within the ./assets directory are the same.
• Hardened GITHUB_TOKEN permissions in all workflows. Closes chore: Set permissions for GitHub actions #7160.
• Split E2E tests in batches to avoid longer wait times in CI.
• Generate assets checksums; Add checksums to build assets PR comment; Upload checksums to GCP storage for base branch assets.
• Remove code coverage steps from the feature tests.
• Replace peter-evans/create-or-update-comment@v3 with official actions/github-script@v6 action to post comments on PR.
• Remove the composer normalize job and move it to Lint PHP job which uses globally installed composer-normalize

Checklist

• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

[github-actions]

Plugin builds for c86bdb1 are ready 🛎️!

• Download development build
• Download production build

Checksums

# Development build checksums
5fc3355870350e82ab6eb235f1bfea30f91407ce918c7f3ad106013f04941abf *amp.zip

# Production build checksums
184bad5a82607954c00982c073e1a1cd851d81e48fb2ce25d8420f59a489b9ce *amp.zip

Warning

These builds are for testing purposes only and should not be used in production.

[codecov]

Codecov Report

Merging #7649 (74e75b4) into develop (c1332cc) will decrease coverage by 73.03%.
Report is 2 commits behind head on develop.
The diff coverage is 0.00%.

❗ Current head 74e75b4 differs from pull request most recent head ae84b4e. Consider uploading reports for the commit ae84b4e to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #7649       +/-   ##
=============================================
- Coverage      77.34%   4.31%   -73.03%     
+ Complexity      6902    6893        -9     
=============================================
  Files            210     277       +67     
  Lines          22173   17852     -4321     
=============================================
- Hits           17150     771    -16379     
- Misses          5023   17081    +12058     

Flag	Coverage Δ
javascript	64.73% <ø> (?)
php	0.00% <0.00%> (-77.35%)	⬇️
unit	0.00% <0.00%> (-77.35%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
includes/deprecated.php	0.00% <ø> (ø)
includes/sanitizers/class-amp-bento-sanitizer.php	0.00% <ø> (ø)
src/Admin/SiteHealth.php	0.00% <ø> (-65.85%)	⬇️
amp.php	0.00% <0.00%> (ø)

... and 261 files with indirect coverage changes