[chore]: use ErrorContains and EqualError

[mmorel-35]

Description

Testifylint doesn't support it yet.
This replaces Contains(t, err.Error() by ErrorContains(t, err and Equal(t, err.Error() by EqualError(t, err
As they both check for nil error it becomes useless to check it yourself without having defined a custom message

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.47%. Comparing base (d128618) to head (ba8344d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11295   +/-   ##
=======================================
  Coverage   91.47%   91.47%           
=======================================
  Files         424      424           
  Lines       20219    20219           
=======================================
  Hits        18495    18495           
  Misses       1341     1341           
  Partials      383      383           

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