🐛 Biome doesn't throw errors for files that can't handle

[ematipico]

Environment information

main

What happened?

Try to handle a file that Biome doesn't know how to handle.

I should print a diagnostic saying that it doesn't know how to handle a file. This is a regression that was introduced way back, and we didn't catch because we don't have a test for it

Expected result

I should throw a diagnostic. Users should use files.ignore or files.ignoreUnknown

Code of Conduct

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