stop writing dvc.yaml to repo during fabric tests

[dberenbaum]

I keep accidentally committing a dvc.yaml file to the repo because it was being generated during these tests.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3d70888) 95.55% compared to head (ebead13) 95.55%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #782 +/- ## ======================================= Coverage 95.55% 95.55% ======================================= Files 55 55 Lines 3532 3532 Branches 314 314 ======================================= Hits 3375 3375 Misses 110 110 Partials 47 47 ```

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