Disable rolling CI

[adityapande-1995]

Rolling is moving to Ubuntu Noble, and won't be releasing new packages on Jammy.

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This change is 

[IanTheEngineer]

My preference would be to simply turn off the rolling CI job for now. I don't think we wish to support Iron as it isn't an LTS and will go EoL in November of 2024 anyway.

[IanTheEngineer]

I just have a small nit around the commented code.

Reviewed 4 of 4 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @adityapande-1995, @ahcorde, and @calderpg-tri)

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.github/workflows/main.yml line 18 at r2 (raw file):

        include:
          #- os_code_name: jammy
          #  ros_distro: rolling

Nit: My preference would be to remove these dead code comments and add a TODO to re-add rolling if / when backward compatible support of some sort comes along, whether it be tarball or Debian.