Automatic merge from submit-queue (batch tested with PRs 45877, 46846, 46630, 46087, 47003)

Remove duplicate errors from an aggregate error input.

This PR, in general, removes duplicate errors from an aggregate error input, and returns unique errors with their occurrence count. Specifically,  this PR helps with some scheduler errors that fill the log enormously. For example, see the following `truncated` output from a 300-plus nodes cluster, as there was a same error from almost all nodes.


[SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected., SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found.........

After this PR, the output looks like (on a 2-node cluster):

SchedulerPredicates failed due to persistentvolumeclaims "mongodb" not found, which is unexpected.(Count=2)

@derekwaynecarr @smarterclayton @kubernetes/sig-scheduling-pr-reviews 

Fixes https://github.com/kubernetes/kubernetes/issues/47145