[release-v1.58] Fix DataImportCron PVC GC race and test flakiness #3063
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What this PR does / why we need it:
Manual backport of #3057
PVC should be timestamped in creation and not only upon import completion, as it might be mistakenly GCed. LRU sort will choose PVC with empty timestamp as the first candidate for deletion. The PVC will be recreated by the controller and eventually timestamped, so this bug was hidden for a while.
Which issue(s) this PR fixes:
Fixes CNV-36896
Special notes for your reviewer:
Release note: