[release-1.14] Avoid wrapping failed PVB status with empty message.

[mrnold]

Please add a summary of your change

Cherry-pick of #8028 to the release-1.14 branch, removes a ':' from the start of failed PVB status message.

Does your change fix a particular issue?

Fixes #7857

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.

[blackpiglet]

Could you help to rebase the branch with release-1.14?
@mrnold

[mrnold]

@blackpiglet Okay, I rebased on top of the latest release-1.14.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 58.77%. Comparing base (ebafe12) to head (76a3ecc).

Files	Patch %	Lines
pkg/controller/pod_volume_backup_controller.go	0.00%	4 Missing ⚠️
pkg/cmd/cli/nodeagent/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.14    #8037      +/-   ##
================================================
- Coverage         58.77%   58.77%   -0.01%     
================================================
  Files               346      346              
  Lines             28821    28824       +3     
================================================
  Hits              16940    16940              
- Misses            10452    10455       +3     
  Partials           1429     1429              

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