[RHEL-CI] Rename workflow and don't run on push (backport #1326)

[mergify]

This is an automatic backport of pull request #1326 done by Mergify.
Cherry-pick of fd2cc4e has failed:

On branch mergify/bp/humble/pr-1326
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit fd2cc4e.
  (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/rm <file>..." as appropriate to mark resolution)
	both modified:   .github/workflows/humble-rhel-binary-build.yml
	deleted by us:   .github/workflows/iron-rhel-binary-build.yml
	both modified:   .github/workflows/rolling-rhel-binary-build.yml

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

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2d31b1b) 31.17% compared to head (32f8788) 31.17%.
Report is 1 commits behind head on humble.

Additional details and impacted files

@@           Coverage Diff           @@
##           humble    #1327   +/-   ##
=======================================
  Coverage   31.17%   31.17%           
=======================================
  Files          95       95           
  Lines       10706    10706           
  Branches     7401     7401           
=======================================
  Hits         3338     3338           
  Misses        706      706           
  Partials     6662     6662           

Flag	Coverage Δ
unittests	31.17% <ø> (ø)

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