chore: use testify instead of testing in tests/e2e

[mmorel-35]

Description

This uses testify instead of testing for t.Fatal or t.Error calls in tests/e2e package

Related to #18972

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.94%. Comparing base (8f933a5) to head (f517bd7).

Additional details and impacted files

see 46 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19615      +/-   ##
==========================================
- Coverage   68.81%   65.94%   -2.87%     
==========================================
  Files         421      421              
  Lines       35863    35863              
==========================================
- Hits        24678    23651    -1027     
- Misses       9754    10807    +1053     
+ Partials     1431     1405      -26     

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[mmorel-35]

/assign @serathius

[k8s-ci-robot]

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