Enable 24.04 CI on harmonic

[scpeters]

🎉 New feature

Attempting to enable CI on 24.04 for Harmonic (partial backport of #587)

Summary

The python3-distutils package is not available on 24.04, but we only use it in a codepath for old versions of cmake. Since 24.04 has a new enough version of cmake, that package is moved from the generic package.apt file to distro-specific packages-focal.apt and packages-jammy.apt files.

• Don't install python3-distutils on 24.04
• Remove old ruby cmake code

Test it

Observe CI results.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.11%. Comparing base (11caaf7) to head (04e3669).
Report is 4 commits behind head on gz-math7.

❗ Current head 04e3669 differs from pull request most recent head 355780f. Consider uploading reports for the commit 355780f to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##           gz-math7     #590   +/-   ##
=========================================
  Coverage     94.11%   94.11%           
=========================================
  Files           146      146           
  Lines          9809     9809           
=========================================
  Hits           9232     9232           
  Misses          577      577           

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

[azeey]

I don't think we need it in Jammy either (see gazebosim/gz-sim#2374 (comment))

[scpeters]

you're right; I knew we need it for focal and wasn't thinking clearly about jammy. removed in 355780f