Garden EOL (backport #662)

[mergify]

Part of gazebo-tooling/release-tools#1165.

Since it will be possible to install Garden packages after EOL, I simply added footnotes on the rows that have EOLs. I also removed Garden from one of the suggested releases to install.

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This is an automatic backport of pull request #662 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 63b651a has failed:

On branch mergify/bp/jazzy/pr-662
Your branch is up to date with 'origin/jazzy'.

You are currently cherry-picking commit 63b651a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both added:      .github/workflows/ros2-ci.yml
	both added:      README.md
	both added:      ros_gz/CHANGELOG.rst
	both added:      ros_gz/package.xml
	both added:      ros_gz_bridge/CHANGELOG.rst
	both added:      ros_gz_bridge/package.xml
	both added:      ros_gz_image/CHANGELOG.rst
	both added:      ros_gz_image/package.xml
	both added:      ros_gz_interfaces/CHANGELOG.rst
	both added:      ros_gz_interfaces/package.xml
	both added:      ros_gz_sim/CHANGELOG.rst
	both added:      ros_gz_sim/package.xml
	both added:      ros_gz_sim_demos/CHANGELOG.rst
	both added:      ros_gz_sim_demos/package.xml
	both added:      test_ros_gz_bridge/CHANGELOG.rst
	both added:      test_ros_gz_bridge/package.xml

no changes added to commit (use "git add" and/or "git commit -a")

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