Consolidate packages.apt files

[scpeters]

🦟 Bug fix

Small follow-up to #526

Summary

The packages-focal.apt file was removed in #526, so packages-jammy.apt can now be consolidated with packages.apt, which is done here.

Checklist

• Signed all commits for DCO
• Added tests
• 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

Merging #528 (d54c106) into main (605041e) will not change coverage.
The diff coverage is n/a.

❗ Current head d54c106 differs from pull request most recent head 9cbc637. Consider uploading reports for the commit 9cbc637 to get more accurate results

@@           Coverage Diff           @@
##             main     #528   +/-   ##
=======================================
  Coverage   77.15%   77.15%           
=======================================
  Files         139      139           
  Lines        7603     7603           
=======================================
  Hits         5866     5866           
  Misses       1737     1737           

[azeey]

@j-rivero Looks like we still have ignition_physics-ci-pr_any-ubuntu_auto-amd64 in addition to gz_physics-ci-pr_any-jammy-amd64

[scpeters]

also we should remove Ubuntu Focal CI from the list of required CI jobs for the main branch

[scpeters]

also we should remove Ubuntu Focal CI from the list of required CI jobs for the main branch

I removed Ubuntu Focal CI from the list of required CI checks for the main branch, but there is a bit more configuration needed before the harmonic release

[scpeters]

@j-rivero Looks like we still have ignition_physics-ci-pr_any-ubuntu_auto-amd64 in addition to gz_physics-ci-pr_any-jammy-amd64

for now I will replace ignition_physics-ci-pr_any-ubuntu_auto-amd64 with gz_physics-ci-pr_any-jammy-amd64 in the list of required builds for the main branch