chore(ci): Drop stable29 from CI jobs as it's end of life

[mejo-]

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.86%. Comparing base (c384831) to head (24d48b4).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7128   +/-   ##
=======================================
  Coverage   51.86%   51.86%           
=======================================
  Files         478      478           
  Lines       40709    40709           
  Branches      993      993           
=======================================
  Hits        21112    21112           
  Misses      19492    19492           
  Partials      105      105           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.