chore(nrpgx5): code cleanup

[bduranleau-nr]

Remove unused variables, modernize by replacing interface{} with any.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.07%. Comparing base (4f6c4e1) to head (297dce4).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1092      +/-   ##
===========================================
+ Coverage    78.04%   78.07%   +0.03%     
===========================================
  Files          159      159              
  Lines        15811    15810       -1     
===========================================
+ Hits         12340    12344       +4     
+ Misses        3058     3053       -5     
  Partials       413      413              

see 2 files with indirect coverage changes

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[Newrelic-Boomi]

https://new-relic.atlassian.net/browse/NR-466143