chore: make pre-check work on release-* branches

[mstruebing]

As discussed here: #2702
Updating the pre-check script to run on release branches.

Backports for current release branches (1.1 - 1.3):

• [BACKPORT 1.1] chore: make pre-check work on release-* branches #2711
• [BACKPORT 1.2] chore: make pre-check work on release-* branches #2712
• [BACKPORT 1.3] chore: make pre-check work on release-* branches  #2713

Redacted output:

debian@box: /home/debian/projects/contrib/javascript git:(main)
➜   ./pre-check.sh
debian@box: /home/debian/projects/contrib/javascript git:(main)
➜   echo $?
0
debian@box: /home/debian/projects/contrib/javascript git:(main)
➜   git checkout release-1.1
Switched to branch 'release-1.1'
Your branch is up to date with 'origin/release-1.1'.
debian@box: /home/debian/projects/contrib/javascript git:(release-1.1)
➜   g cherry-pick 38b765883dd4ab0a9627fb6ee7288eabf7756cea
debian@box: /home/debian/projects/contrib/javascript git:(release-1.1)
➜   ./pre-check.sh
debian@box: /home/debian/projects/contrib/javascript git:(release-1.1)
➜   echo $?
0
debian@box: /home/debian/projects/contrib/javascript git:(release-1.1)
➜   g co main
Switched to branch 'main'
Your branch is ahead of 'origin/main' by 1 commit.
  (use "git push" to publish your local commits)
debian@box: /home/debian/projects/contrib/javascript git:(main)
➜   g co -b max/succeed-pre-check-on-release-branch
Switched to a new branch 'max/succeed-pre-check-on-release-branch'
debian@box: /home/debian/projects/contrib/javascript git:(max/succeed-pre-check-on-release-branch)
➜   ./pre-check.sh
This script can only be run on the main or release-* branches. Current branch is max/succeed-pre-check-on-release-branch

[cjihrig]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjihrig, mstruebing

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