[CherryPick][1.14] Merge pull request #7983 from anshulahuja98/snapshotsync

[anshulahuja98]

Reset VolumeSnapshotRef in Backup Sync Flow
Fixes #7978
Thank you for contributing to Velero!

Please add a summary of your change

Does your change fix a particular issue?

Fixes #(issue)

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: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-1.14@80a5b51). Learn more about missing BASE report.

Files	Patch %	Lines
pkg/controller/backup_sync_controller.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release-1.14    #8004   +/-   ##
===============================================
  Coverage                ?   58.79%           
===============================================
  Files                   ?      346           
  Lines                   ?    28823           
  Branches                ?        0           
===============================================
  Hits                    ?    16947           
  Misses                  ?    10445           
  Partials                ?     1431           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[blackpiglet]

One comment.
It seems we should use this commit 4a6a362 instead of the merge commit.