CLOUDP-218696: Check chart was actually released

[josvazg]

Prior logic was checking git tags, which did not seem reliable at times and checks the wrong thing: we do not care as much for the tag to be present in git as for the actual helm chart with the given version to be present in the target helm chart repo.

This change searchs the repo for the expected chart version to check whether it was released or not, before checkign for changes in the chart.

✅ DRYRUN did not find anything to do after release

All Submissions:

• [X] Have you opened an Issue before filing this PR?

[josvazg]

ping @irajdeep @nammn to check for any concerns