fix: enable gofmt and whitespace linters

[mmorel-35]

Enables and fixes gofmt and whitespaces linters.

[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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mmorel-35]

/assign @spzala

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.76%. Comparing base (133918e) to head (095e394).

❗ Current head 095e394 differs from pull request most recent head 33d7f2d

Please upload reports for the commit 33d7f2d to get more accurate results.

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Additional details and impacted files

Files with missing lines	Coverage Δ
client/v3/maintenance.go	58.55% <ø> (ø)
client/v3/retry_interceptor.go	65.61% <ø> (ø)
client/v3/watch.go	93.83% <ø> (+0.19%)	⬆️
etcdctl/ctlv3/command/printer_json.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/watch_command.go	44.08% <ø> (ø)
pkg/adt/interval_tree.go	87.46% <ø> (-1.26%)	⬇️
pkg/netutil/routes_linux.go	44.62% <ø> (ø)
server/auth/store.go	83.79% <ø> (ø)
server/etcdserver/api/membership/storev2.go	45.19% <ø> (ø)
server/etcdserver/api/v2stats/queue.go	28.20% <ø> (ø)
... and 5 more

... and 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18713      +/-   ##
==========================================
+ Coverage   68.75%   68.76%   +0.01%     
==========================================
  Files         420      420              
  Lines       35494    35494              
==========================================
+ Hits        24404    24409       +5     
- Misses       9655     9662       +7     
+ Partials     1435     1423      -12     

---

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[mmorel-35]

/assign @jmhbnz

[henrybear327]

/ok-to-test

[mmorel-35]

/test pull-etcd-integration-1-cpu-arm64

[jmhbnz]

LGTM - Thanks for your effort on this @mmorel-35.

cc @ahrtr, @serathius

[mmorel-35]

/test pull-etcd-robustness-arm64

[ahrtr]

LGTM

Thanks for the cleanup!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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