✨ Additional validation in Cluster/ClusterClass webhook for chained upgrades #12816
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What this PR does / why we need it:
This PR will contain series of commits to add additional validation for Cluster/ClusterClass webhook for chained upgrades and associated UTs.
More info: #12720 (comment)
Which issue(s) this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)format, will close the issue(s) when PR gets merged):Part of #12720
/area clusterclass