release-1.15: CSI: Make cleanup more verbose, and don't fail get on not exist

[kaovilai]

Signed-off-by: Tiger Kaovilai [email protected]

Thank you for contributing to Velero!

Please add a summary of your change

Make velero more verbose when deleting snapshots to help diagnose issues when it does happen.

Test image amd/arm64

ghcr.io/kaovilai/velero:verboseCleanup-r1.15-b26183826

Does your change fix a particular issue?

Fixes #8473

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 58.99%. Comparing base (dd1c6a6) to head (b261838).

Files with missing lines	Patch %	Lines
pkg/util/csi/volume_snapshot.go	57.14%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.15    #8480   +/-   ##
=============================================
  Coverage         58.98%   58.99%           
=============================================
  Files               367      367           
  Lines             38855    38858    +3     
=============================================
+ Hits              22919    22924    +5     
+ Misses            14474    14471    -3     
- Partials           1462     1463    +1     

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[blackpiglet]

@kaovilai
Hi Tiger, is this PR used for debugging only?
I saw this PR is always in draft state, but also make sure this PR is not merged if it's used for debug purpose.

[kaovilai]

For debugging issue yes. If it solves something will open for review