fix: Cannot retrieve IDs for Potential Duplicate Records [DHIS2-16063]

[lucaCambi77]

https://dhis2.atlassian.net/browse/DHIS2-16063

• add uid to GET /potentialDuplicates response
• add MVC test

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #15660 (0eb027d) into master (21d1572) will increase coverage by 0.00%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #15660   +/-   ##
=========================================
  Coverage     66.21%   66.22%           
  Complexity    31267    31267           
=========================================
  Files          3487     3487           
  Lines        129904   129904           
  Branches      15170    15170           
=========================================
+ Hits          86013    86023   +10     
+ Misses        36812    36800   -12     
- Partials       7079     7081    +2     

Flag	Coverage Δ
integration	49.78% <ø> (+<0.01%)	⬆️
integration-h2	32.42% <ø> (+0.02%)	⬆️
unit	30.32% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...troller/deduplication/DeduplicationController.java	83.78% <ø> (+16.21%)	⬆️

... and 1 file with indirect coverage changes

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