Tracks: https://github.com/vmware-tanzu/velero/issues/4129

For kopia, there is .kopiaignore files that user can add to dir being backup.
https://kopia.io/docs/advanced/kopiaignore/
Velero can also in the future hook into fileignore policy.

Proposed title of this feature request
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Why does the customer need this? (List the business requirements here)
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