Run `cargo dev` tests when generated Markdown files change

[charliermarsh]

See: https://github.com/astral-sh/uv/pull/6344#issuecomment-2302489633. If you change just the generated file, we don't run tests.

[zanieb]

Oh.. tricky. We could just be more careful about not merging changes to generated files, but we can also run these tests separately.

[charliermarsh]

We could also include the reference files in the "changed files" list, it should be harmless (but tedious to maintain).

[zanieb]

True, not many reference files.