scalafix for 0.15

[kellen]

Refactors scalafix build to reduce duplication. I couldn't avoid the mess of lazy vals for the projects unfortunately.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.48%. Comparing base (1d7f744) to head (34b0738).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5822      +/-   ##
==========================================
- Coverage   61.59%   61.48%   -0.11%     
==========================================
  Files         315      317       +2     
  Lines       11469    11650     +181     
  Branches      828      818      -10     
==========================================
+ Hits         7064     7163      +99     
- Misses       4405     4487      +82     

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