test(yaml): add `condenseFlow()` test

[codecov[bot]]

Codecov Report

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

Project coverage is 96.23%. Comparing base (bb0db58) to head (7ab7e59). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5780 +/- ## ========================================== - Coverage 96.24% 96.23% -0.01% ========================================== Files 481 481 Lines 38746 38746 Branches 5617 5617 ========================================== - Hits 37290 37289 -1 - Misses 1415 1416 +1 Partials 41 41 ```

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