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

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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](https://app.codecov.io/gh/etcd-io/etcd/pull/18858/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) ```diff @@ 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 ``` ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/etcd-io/etcd/pull/18858?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/etcd-io/etcd/pull/18858?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Last update [0f9c128...c6d9221](https://app.codecov.io/gh/etcd-io/etcd/pull/18858?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None).

[ivanvc]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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