cleans up registry controller integration tests

[ChrisJBurns]

There were some overlapping scenarios across files and a bunch of unused code that clogged up the package. This POR cleans the tests up and removes unused functions

This PR is larger than 1000 diffs mainly because of the amount of unused code we are taking away.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.49%. Comparing base (d8dd49a) to head (6e0eeb1).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2693   +/-   ##
=======================================
  Coverage   55.48%   55.49%           
=======================================
  Files         312      312           
  Lines       30035    30035           
=======================================
+ Hits        16666    16668    +2     
+ Misses      11901    11899    -2     
  Partials     1468     1468           

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