Refactor GC and GC tests to be more reliable

[tstirrat15]

Parting out #2455

Description

Part of getting the testifyrequire linter enabled.

TODO

• Address this comment: Enable all linters and resolve all outstanding lint issues (Resolves issue 2386) #2455 (comment)

Changes

Will annotate.

Testing

Review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.30%. Comparing base (5d34d05) to head (9c452f6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2645      +/-   ##
==========================================
- Coverage   79.14%   78.30%   -0.83%     
==========================================
  Files         452      452              
  Lines       46401    46401              
==========================================
- Hits        36719    36331     -388     
- Misses       6923     7296     +373     
- Partials     2759     2774      +15     

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