[wip] Ignore generated files in Slather

[keefertaylor]

High Level Overview of Change

Context of Change

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Refactor (non-breaking change that only restructures code)
• [ ] Tests (You added tests for code that already exists, or your new feature included in this PR)
• [ ] Documentation Updates
• [ ] Release

Before / After

Test Plan

[codecov[bot]]

Codecov Report

Merging #221 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #221   +/-   ##
=======================================
  Coverage   44.71%   44.71%           
=======================================
  Files          62       62           
  Lines        1997     1997           
=======================================
  Hits          893      893           
  Misses       1104     1104           

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