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Automatic merge from submit-queue (batch tested with PRs 46458, 50934, 50766, 50970, 47698) Skip non-update endpoint updates **What this PR does / why we need it**: On large clusters, a large percentage of endpoint updates are actually non-updates that occur as a result of a change in an associated pod. This results in endpoint updates where the only field that has changed is the `TargetRef.ResourceVersion` in the endpoint address associated with the changed pod. Given enough of these non-updates, the endpoint controller's queue rate limit can be overwhelmed and legitimate updates can be delayed, resulting in (temporarily) broken services. We have clusters where we've seen endpoint updates take 9 minutes. **Which issue this PR fixes** : fixes #50936 **Special notes for your reviewer**: N/A **Release note**: ```release-note Prevent unneeded endpoint updates ```