refactor: enhance API error response validation and accessibility

[ahmed-n-abdeltwab]

implement standardized validation for error responses across various API endpoints.
https://rocketchat.atlassian.net/browse/ARCH-1728

[dionisio-bot]

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Latest commit: 4e8bfd8

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.44%. Comparing base (0776b21) to head (cdeb8f0).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36574      +/-   ##
===========================================
- Coverage    65.84%   64.44%   -1.40%     
===========================================
  Files         3188     2921     -267     
  Lines       106678   102563    -4115     
  Branches     20306    19349     -957     
===========================================
- Hits         70237    66101    -4136     
- Misses       33772    34090     +318     
+ Partials      2669     2372     -297     

Flag	Coverage Δ
e2e	52.07% <ø> (-6.02%)	⬇️

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