chore(ci): remove release epic action (backport #3996)

[mergify]

Overview

The release EPIC action doesn't make sense anymore with the new arabica and mocha tags. Removing it while we work on making some updates to the release tracking.

I added the backport:v2.x tag to make sure any more v2 releases don't create issues. I didn't see a backport label for v3 yet but it would be good to apply this to that branch as well.

---

This is an automatic backport of pull request #3996 done by Mergify.

[mergify]

Cherry-pick of 373eb9d has failed:

On branch mergify/bp/v2.x/pr-3996
Your branch is up to date with 'origin/v2.x'.

You are currently cherry-picking commit 373eb9d4.
  (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)
	deleted by them: .github/workflows/create_release_tracking_epic.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/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[ninabarbakadze]

what do we want to do with this? @cmwaters seems like there's no diff

[cmwaters]

Yeah I think we can just close this. We may have forgotten to extend it to this long-lived branch anyway