feat: CU-86934hnmg rest api skipping fields

[CodeVoyager]

Ticket

#239

Summary

What does this PR do/solve?

• fields of comment entity can be skipped

Test Plan

• start the server
• make a API call like http://localhost:1337/api/comments/<id>?omit[]=blocked&omit[]=related&omit[]=author
• response should not contain specified fields

[cyp3rius]

Task linked: CU-86934hnmg Make related not mandatory population

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 80.49%. Comparing base (2aa8011) to head (f1ea59f).

Files	Patch %	Lines
server/services/common.ts	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
- Coverage   80.56%   80.49%   -0.07%     
==========================================
  Files          35       35              
  Lines         926      933       +7     
  Branches      314      319       +5     
==========================================
+ Hits          746      751       +5     
- Misses        176      178       +2     
  Partials        4        4              

Flag	Coverage Δ
unittest	80.49% <92.30%> (-0.07%)	⬇️

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