release-1.12: Update Backup.Status.CSIVolumeSnapshotsCompleted during finalize

[kaovilai]

• Add PatchResource unit test for backup status
• refactor backup snapshot status updates into UpdateBackupSnapshotsStatus() and run in backup_finalizer_controller
• skip this if SnapshotMoveData
• remove waiting during finalize
• CSIFeatureFlag enable check
• update changelog to reflect removed waits
• make update
• revert test changes

Thank you for contributing to Velero!

Please add a summary of your change

Does your change fix a particular issue?

Fixes #7047
Cherry-picks #7046

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (c042d47) 60.61% compared to head (c8fd9d4) 60.54%.

Files	Patch %	Lines
pkg/backup/snapshots.go	0.00%	41 Missing ⚠️
pkg/cmd/server/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.12    #7111      +/-   ##
================================================
- Coverage         60.61%   60.54%   -0.08%     
================================================
  Files               250      251       +1     
  Lines             26683    26688       +5     
================================================
- Hits              16175    16159      -16     
- Misses             9367     9392      +25     
+ Partials           1141     1137       -4     

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[sseago]

@kaovilai needs rebase