Remove Bionic from future releases (Garden+)

[chapulina]

• See Garden support gazebo-tooling/release-tools#597

Summary

ign-fuel-tools8 will be on Garden.

Test it

No Bionic builds should be triggered.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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.

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[codecov]

Codecov Report

Merging #239 (da21831) into main (3c90110) will not change coverage.
The diff coverage is n/a.

❗ Current head da21831 differs from pull request most recent head 6d0d4b5. Consider uploading reports for the commit 6d0d4b5 to get more accurate results

@@           Coverage Diff           @@
##             main     #239   +/-   ##
=======================================
  Coverage   75.65%   75.65%           
=======================================
  Files          20       20           
  Lines        2748     2748           
=======================================
  Hits         2079     2079           
  Misses        669      669           

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[chapulina]

This is good to go!

[scpeters]

windows test failures are pre-existing on main

https://build.osrfoundation.org/view/ign-garden/job/ign_fuel-tools-ci-win/18/