fix: enable gofumpt instead of gofmt linter in tools

[mmorel-35]

enables and fixes gofumpt linter issues in tools directory

[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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[mmorel-35]

/assign @ahrtr

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.79%. Comparing base (0f9c128) to head (073d9c6).

❗ Current head 073d9c6 differs from pull request most recent head c6d9221

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Additional details and impacted files

see 25 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18858      +/-   ##
==========================================
- Coverage   68.80%   68.79%   -0.01%     
==========================================
  Files         420      420              
  Lines       35532    35532              
==========================================
- Hits        24448    24445       -3     
- Misses       9662     9663       +1     
- Partials     1422     1424       +2     

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[ivanvc]

/ok-to-test

[ivanvc]

LGTM. Thanks, @mmorel-35

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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