fix: enable gofumpt instead of gofmt linter globally

[mmorel-35]

Description

enables and fixes gofumpt linter issues globally

Closes #18955

[k8s-ci-robot]

Hi @mmorel-35. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.78%. Comparing base (8f91eb1) to head (f75f402).
Report is 15 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/expect/expect.go	79.12% <ø> (ø)
pkg/netutil/routes_linux.go	44.62% <ø> (ø)
pkg/traceutil/trace.go	98.09% <100.00%> (+0.01%)	⬆️

... and 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18956      +/-   ##
==========================================
- Coverage   68.80%   68.78%   -0.03%     
==========================================
  Files         420      420              
  Lines       35575    35576       +1     
==========================================
- Hits        24479    24470       -9     
- Misses       9670     9682      +12     
+ Partials     1426     1424       -2     

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[mmorel-35]

/assign @ahrtr

[ahrtr]

/ok-to-test

[jmhbnz]

LGTM - Thanks @mmorel-35

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, jmhbnz, mmorel-35

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• OWNERS [ahrtr,jmhbnz]

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