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.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (fe14e24) to head (68af9dd).

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18971      +/-   ##
==========================================
+ Coverage   68.77%   68.82%   +0.04%     
==========================================
  Files         420      420              
  Lines       35623    35623              
==========================================
+ Hits        24500    24517      +17     
+ Misses       9698     9687      -11     
+ Partials     1425     1419       -6     

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[ahrtr]

/ok-to-test

[mmorel-35]

/test pull-etcd-verify

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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