Remove Bionic from future releases (Garden+)

[chapulina]

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

Summary

ign-rendering7 will be on Garden.

Test it

No Bionic builds should be triggered. I hope the camera test passes on Focal.

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 #583 (71e5a57) into main (2908969) will increase coverage by 0.35%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##             main     #583      +/-   ##
==========================================
+ Coverage   53.08%   53.43%   +0.35%     
==========================================
  Files         214      214              
  Lines       21299    21301       +2     
==========================================
+ Hits        11306    11383      +77     
+ Misses       9993     9918      -75     

Impacted Files	Coverage Δ
include/ignition/rendering/HeightmapDescriptor.hh	100.00% <ø> (ø)
include/ignition/rendering/Mesh.hh	100.00% <ø> (ø)
ogre2/src/Ogre2Heightmap.cc	0.00% <0.00%> (ø)
ogre/src/OgreHeightmap.cc	72.70% <100.00%> (ø)
...lude/ignition/rendering/base/BaseDistortionPass.hh	0.00% <0.00%> (ø)
ogre2/src/Ogre2RenderEngine.cc	78.72% <0.00%> (+0.21%)	⬆️
ogre/src/OgreRenderEngine.cc	73.65% <0.00%> (+0.29%)	⬆️
ogre2/src/Ogre2Mesh.cc	83.80% <0.00%> (+0.70%)	⬆️
...e/ignition/rendering/base/BaseGaussianNoisePass.hh	100.00% <0.00%> (+3.33%)	⬆️
ogre2/src/Ogre2MaterialSwitcher.cc	79.41% <0.00%> (+6.86%)	⬆️
... and 1 more

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[chapulina]

This is good to go!