Add volume backup result

[blackpiglet]

Thank you for contributing to Velero!

Please add a summary of your change

• Add the result in the backup's VolumeInfo.
• Add more prow actions.

Does your change fix a particular issue?

Fixes #7676

Please indicate you've done the following:

• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 58.83%. Comparing base (c827fd0) to head (df28134). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7775 +/- ## ========================================== + Coverage 58.79% 58.83% +0.03% ========================================== Files 345 345 Lines 28766 28793 +27 ========================================== + Hits 16914 16941 +27 Misses 10423 10423 Partials 1429 1429 ```

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[reasonerjt]

Let's revisit to determine if it should target v1.14.1

[blackpiglet]

/cc @reasonerjt