extension_cli: Error on unrecognized files and queries in language directories (#63080)

This ensures that we do not copy over resources we do not need for
languages. We enforce this at this stage so that potential contributors
to these extensions do not think these files might be needed for the
given language.

Release Notes:

- N/A
5f2d7ad735Finn Evers committed on 9/2/2026, 10:45:15 PM· committed by GitHubparent0038263
1 file changedLine totals unavailable