chore: use testify instead of testing in tests/integration

[mmorel-35]

Description

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

Related to #18972

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.86%. Comparing base (f07e2ae) to head (d05b8b7).
Report is 40 commits behind head on main.

Additional details and impacted files

see 26 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19616      +/-   ##
==========================================
+ Coverage   68.77%   68.86%   +0.08%     
==========================================
  Files         421      421              
  Lines       35897    35897              
==========================================
+ Hits        24689    24721      +32     
+ Misses       9786     9748      -38     
- Partials     1422     1428       +6     

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