fix: enable error-nil rule from testifylint

[mmorel-35]

This fixes error-nil rule from testifylint.

[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 @spzala
/assign @jmhbnz

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.72%. Comparing base (f0187c3) to head (01e5f19).

❗ Current head 01e5f19 differs from pull request most recent head a416a07

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Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18716      +/-   ##
==========================================
- Coverage   68.72%   68.72%   -0.01%     
==========================================
  Files         420      420              
  Lines       35494    35494              
==========================================
- Hits        24394    24393       -1     
+ Misses       9676     9675       -1     
- Partials     1424     1426       +2     

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[ivanvc]

/ok-to-test

[mmorel-35]

/test pull-etcd-robustness-amd64

[ahrtr]

LGTM

Thanks

[ivanvc]

LGTM. Thanks, Matthieu.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ivanvc]

Link to #18719