build: use GitHub Actions concurrency groups to cancel workflows

[sebastianliebscher]

SUMMARY

This PR removes custom scripts to cancel running GitHub Actions workflows and replaces them with the built-in functionality concurrency groups.

This will cancel all running workflow jobs for PRs only. In case it is not a PR, this won't cancel running jobs as run_id is unique.

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
  cancel-in-progress: true

Partially reverts #12090

---

In case we want to cancel running jobs for commits to master or release tags also, it can be modified to:

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

https://docs.github.com/en/actions/learn-github-actions/contexts#github-context

TESTING INSTRUCTIONS

You can see the cancelled workflows for the first commit:

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[villebro]

@sebastianliebscher nice work, looking forward to reviewing this once it's out of draft state!

[sebastianliebscher]

ping @villebro

[rusackas]

This one seems to have slipped under the radar, but it's a fantastic idea! It just needs a rebase, and I think we should be all good. CC @mistercrunch since he might want to take a look at this too.

[mistercrunch]

LGTM, let's rebase and merge it!

[mistercrunch]

Thank @sebastianliebscher for the idea/code, took over here -> #26945 closing this one