fix: use require instead of t.Fatal(err) in tests/robustness package

[mmorel-35]

Description

This uses testify instead of testing for t.Fatal calls

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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[mmorel-35]

/assign @spzala

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.77%. Comparing base (18eb5c6) to head (5babe03).

❗ Current head 5babe03 differs from pull request most recent head 4017eba

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Additional details and impacted files

see 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18782      +/-   ##
==========================================
+ Coverage   68.74%   68.77%   +0.03%     
==========================================
  Files         420      420              
  Lines       35512    35512              
==========================================
+ Hits        24411    24425      +14     
+ Misses       9671     9658      -13     
+ Partials     1430     1429       -1     

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[jmhbnz]

/ok-to-test

[mmorel-35]

/retest

[mmorel-35]

/retest

[mmorel-35]

/test pull-etcd-integration-1-cpu-amd64

[mmorel-35]

/retest

[ivanvc]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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