Add existingResourcePolicy restore CR validation to controller.

[kaovilai]

Signed-off-by: Tiger Kaovilai tkaovila@redhat.com

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Does your change fix a particular issue?

Fixes #7347

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.

[anshulahuja98]

@kaovilai CI is failing, can you pl check Verifying goimports - failed! Please run 'make update'.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 58.66%. Comparing base (8f78aaa) to head (3c937d4). Report is 16 commits behind head on main.

Files	Patch %	Lines
pkg/cmd/cli/restore/create.go	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7757 +/- ## ========================================== + Coverage 58.64% 58.66% +0.01% ========================================== Files 344 345 +1 Lines 28720 28733 +13 ========================================== + Hits 16843 16856 +13 - Misses 10447 10448 +1 + Partials 1430 1429 -1 ```

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[kaovilai]

Fixed make update! Thanks all.

[kaovilai]

labels PR fix https://github.com/vmware-tanzu/velero/pull/7776