[release-1.14] Reuse existing plugin manager for get/put volume info

[sseago]

Thank you for contributing to Velero!

Please add a summary of your change

Reuse existing plugin manager for get/put volume info.
Cherry-pick of #8012 and #8014

Does your change fix a particular issue?

Fixes #7925

Please indicate you've done the following:

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

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.77%. Comparing base (0c38aa2) to head (89a5363).

Files	Patch %	Lines
pkg/backup/backup.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.14    #8016      +/-   ##
================================================
- Coverage         58.77%   58.77%   -0.01%     
================================================
  Files               346      346              
  Lines             28833    28818      -15     
================================================
- Hits              16947    16938       -9     
+ Misses            10454    10451       -3     
+ Partials           1432     1429       -3     

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[Lyndon-Li]

@sseago DCO CI failed, so the PR cannot be merged. Looks like one commit was not signed off. Please help to fix it.