Rename relation annotation refs field to keys

[hasathcharu]

Purpose

This is part of the fix for the below task.
Fixes:

• #6180

Checklist

• Linked to an issue
• Updated the specification
• Updated the changelog
• Added tests
• Checked native-image compatibility

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.37%. Comparing base (733705e) to head (459b1d2).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #277   +/-   ##
=========================================
  Coverage     88.37%   88.37%           
  Complexity      365      365           
=========================================
  Files            30       30           
  Lines          1170     1170           
  Branches        145      145           
=========================================
  Hits           1034     1034           
  Misses           85       85           
  Partials         51       51           

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