test: remove hybrid systems from downstream tests

[AayushSabharwal]

Checklist

• [ ] Appropriate tests were added
• [ ] Any code changes were done in a way that does not break public API
• [ ] All documentation related to code changes were updated
• [ ] The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• [ ] Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov[bot]]

Codecov Report

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

Project coverage is 41.34%. Comparing base (c312fd8) to head (ad5c2ce).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #713 +/- ## ======================================= Coverage 41.34% 41.34% ======================================= Files 55 55 Lines 4632 4632 ======================================= Hits 1915 1915 Misses 2717 2717 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.