chore: use testify instead of testing in tests/integration

[mmorel-35]

Description

This uses testify instead of testing for t.Fatal calls in tests/integration package.

@ahrtr, I’m sorry that this is so big but it’s only t.Fatal on errors replacements.

Related to #18972

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.93%. Comparing base (e13196b) to head (d1adc37).
Report is 10 commits behind head on main.

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19332      +/-   ##
==========================================
+ Coverage   68.88%   68.93%   +0.05%     
==========================================
  Files         420      420              
  Lines       35706    35707       +1     
==========================================
+ Hits        24596    24615      +19     
+ Misses       9687     9674      -13     
+ Partials     1423     1418       -5     

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[ahrtr]

Please resolve the workflow failure.

cc @ivanvc

[ahrtr]

Is this PR the last one to fully resolve #18972?

[mmorel-35]

/test pull-etcd-robustness-amd64

[mmorel-35]

Is this PR the last one to fully resolve #18972?

I'm afraid not... There are still many t.Fatal or t.Error that can converted . You can grep this

[ahrtr]

I'm afraid not... There are still many t.Fatal or t.Error that can converted . You can grep this

I will cut release-3.6 at the end of this week. Afterwards, feel free to continue to change on the main only.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[mmorel-35]

I will cut release-3.6 at the end of this week. Afterwards, feel free to continue to change on the main only.

@ahrtr , what do you mean by main only ? That seems really touchy . It feels safer to be on a branch but I understand it's a lot to review

[ahrtr]

what do you mean by main only ?

We will cut release-3.6 branch in the following 2 days. After that, all following such PRs only go to the main branch