fix: use testify instead of t.Fatal or t.Error in server package (part 1)

[mmorel-35]

Description

This uses testify instead of testing for t.Fatal or t.Error calls in server package

Related to #18972

[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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.83%. Comparing base (ebb2b06) to head (c3fb795).
Report is 166 commits behind head on main.

Additional details and impacted files

see 22 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #18971   +/-   ##
=======================================
  Coverage   68.83%   68.83%           
=======================================
  Files         420      420           
  Lines       35641    35641           
=======================================
  Hits        24532    24532           
- Misses       9687     9691    +4     
+ Partials     1422     1418    -4     

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[ahrtr]

/ok-to-test

[mmorel-35]

/test pull-etcd-verify

[ahrtr]

cc @ivanvc @jmhbnz @fuweid

[ahrtr]

cc @fuweid @ivanvc @jmhbnz @serathius @siyuanfoundation

[fuweid]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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