Refactor exclusive type to Optional typing

[gaiksaya]

Description

After thorough debugging, as to why the groovy tests were hanging in build-repo (atleast in local), looks like class loading was the issue. Even though both classes ReleaseMetricsData and ReleaseCandidateStatus do not depend on each other in anyway, specifying explicit type OpenSearchMetricsQuery in field declarations was causing the issue.

Changed it to def which just treats it as a generic Object.

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.61%. Comparing base (12efe78) to head (25dcf63).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #582   +/-   ##
=========================================
  Coverage     84.61%   84.61%           
  Complexity      133      133           
=========================================
  Files           123      123           
  Lines           780      780           
  Branches         86       86           
=========================================
  Hits            660      660           
  Misses           33       33           
  Partials         87       87           

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