chore: apply gofumpt in pkg packages

[mmorel-35]

Thank you for contributing to Velero!

Please add a summary of your change

chore: apply gofumpt in pkg packages

Activation in golangci-lint config will happen in a later PR

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

Attention: Patch coverage is 71.87500% with 27 lines in your changes missing coverage. Please review.

Project coverage is 59.33%. Comparing base (5b1738a) to head (3a2210a).

Files with missing lines	Patch %	Lines
pkg/controller/pod_volume_restore_controller.go	0.00%	3 Missing ⚠️
...k/backupitemaction/v2/backup_item_action_server.go	25.00%	3 Missing ⚠️
...restoreitemaction/v2/restore_item_action_server.go	0.00%	3 Missing ⚠️
pkg/cmd/util/output/backup_structured_describer.go	0.00%	2 Missing ⚠️
pkg/restore/actions/change_image_name_action.go	0.00%	2 Missing ⚠️
pkg/client/config.go	50.00%	0 Missing and 1 partial ⚠️
pkg/cmd/util/output/backup_describer.go	0.00%	1 Missing ⚠️
pkg/controller/backup_deletion_controller.go	50.00%	1 Missing ⚠️
...g/controller/backup_storage_location_controller.go	0.00%	1 Missing ⚠️
pkg/controller/backup_sync_controller.go	50.00%	1 Missing ⚠️
... and 9 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8613   +/-   ##
=======================================
  Coverage   59.33%   59.33%           
=======================================
  Files         370      370           
  Lines       39932    39906   -26     
=======================================
- Hits        23692    23677   -15     
+ Misses      14744    14734   -10     
+ Partials     1496     1495    -1     

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[kaovilai]

@reasonerjt @Lyndon-Li thoughts on using this notation for octal?

[reasonerjt]

I think we've been using gofmt which is official.

Do wanna us gofumpt which is a fork of gofmt?

I'm tentatively blocking the merge of the PR until the maintainers reach the agreement.

I think we've been using gofmt which is official.

Do wanna us gofumpt which is a fork of gofmt?

I'm tentatively blocking the merge of the PR until the maintainers reach the agreement.