Modify golangci configuration to make it work.

[blackpiglet]

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https://github.com/vmware-tanzu/velero/actions/runs/13363546193/job/37317100078#step:4:30
The linter check action failed after some linter PR merged.
This PR aims to resolve the failures.

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Fixes #(issue)

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• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.46%. Comparing base (2b0c509) to head (e736ef7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8695      +/-   ##
==========================================
- Coverage   59.48%   59.46%   -0.02%     
==========================================
  Files         371      371              
  Lines       40191    40191              
==========================================
- Hits        23909    23901       -8     
- Misses      14789    14796       +7     
- Partials     1493     1494       +1     

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[mmorel-35]

For the record I proposed #8641 on 22 January.
It doesn't cover all of the modifications done here but enough to upgrade golangci-lint to 1.63.4

[blackpiglet]

@mmorel-35
#8641 This PR contains more things than to fix the linter errors.
Could we fix the actions error first, then consider whether we should merge #8641?

[mmorel-35]

That's fine for me

[mmorel-35]

Now that this has been merged to main branch, I just rebased #8641