FIX - Jaxb configuration changed to serialize EntityUniquenessExceptionInfo

[Agnul97]

Brief description of the PR.
Before this PR Jaxb was not correctly serializing the EntityUniquenessExceptionInfo that we insert in the response body if needed. It was, instead, serializing to a basic ExceptionInfo without the additional fields in EntityUniquenessExceptionInfo class.

Description of the solution adopted
The problem was that the EntityUniquenessExceptionInfo class was not inserted inside the configuration of jaxb so the framework was not able to perform the operation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1c6be69) 20.73% compared to head (40b073c) 20.73%.
Report is 14 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #3943   +/-   ##
==========================================
  Coverage      20.73%   20.73%           
  Complexity         6        6           
==========================================
  Files           1951     1951           
  Lines          41767    41767           
  Branches        3959     3959           
==========================================
  Hits            8661     8661           
  Misses         32703    32703           
  Partials         403      403           

Files	Coverage Δ
...eclipse/kapua/app/api/web/JaxbContextResolver.java	77.77% <ø> (ø)