[Access] Improve bounds checking in rest converters

[AndriiDiachuk]

Closes: #6564

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 41.57%. Comparing base (0dde730) to head (8595b62).

Files with missing lines	Patch %	Lines
engine/access/rest/util/converter.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6567      +/-   ##
==========================================
+ Coverage   41.28%   41.57%   +0.28%     
==========================================
  Files        2033     2033              
  Lines      145981   181701   +35720     
==========================================
+ Hits        60269    75538   +15269     
- Misses      79486    99940   +20454     
+ Partials     6226     6223       -3     

Flag	Coverage Δ
unittests	41.57% <0.00%> (+0.28%)	⬆️

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