Regression: panic messages about invalid mdtests are now swallowed by mdtest #15317
Description
Following #15241, some of the internal error messages from red_knot_test are now swallowed by the framework, for example this one here:
ruff/crates/red_knot_test/src/lib.rs
Lines 32 to 37 in b264489
On a PR branch I was working on, I got this (not very informative!) test failure:
If I revert 75015b0 on that PR branch, I get this instead, which is much more helpful:
