chore: enable early-return, if-return and superfluous-else from revive

[mmorel-35]

Thank you for contributing to Velero!

Please add a summary of your change

enables and fixes this rules from revive

• early-return
• if-return
• superfluous-else

Enable preserveScope for indent-error-flow to not suggest refactorings that would increase variable scope.

Does your change fix a particular issue?

Fixes #(issue)

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.

[mmorel-35]

/kind changelog-not-required

[codecov]

Codecov Report

❌ Patch coverage is 83.20000% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.70%. Comparing base (6085044) to head (fc24af1).
⚠️ Report is 103 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/volume/volumes_information.go	92.74%	7 Missing and 2 partials ⚠️
pkg/uploader/kopia/block_restore.go	0.00%	5 Missing ⚠️
pkg/cmd/server/server.go	50.00%	3 Missing ⚠️
pkg/controller/restore_controller.go	72.72%	2 Missing and 1 partial ⚠️
pkg/repository/maintenance/maintenance.go	0.00%	3 Missing ⚠️
pkg/restore/restore.go	40.00%	2 Missing and 1 partial ⚠️
pkg/util/csi/volume_snapshot.go	40.00%	3 Missing ⚠️
pkg/backup/actions/csi/pvc_action.go	94.73%	1 Missing ⚠️
pkg/client/retry.go	0.00%	1 Missing ⚠️
pkg/controller/data_download_controller.go	66.66%	1 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8640      +/-   ##
==========================================
+ Coverage   59.67%   59.70%   +0.03%     
==========================================
  Files         381      381              
  Lines       43879    43787      -92     
==========================================
- Hits        26186    26145      -41     
+ Misses      16147    16109      -38     
+ Partials     1546     1533      -13     

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[mmorel-35]

OK, I provided comments and links for each new rule

[kaovilai]

LGTM - purely stylistic linter refactoring with no logical changes.