Test

Fix _search_for_backing_files_recursively() to support multifile parq… #2321

Job	Run time
test (macos-latest, 3.14, allow, prerelease)	2m 50s
test (ubuntu-latest, 3.14, latest)	2m 41s
test (macos-latest, 3.11, latest)	2m 50s
test (windows-latest, 3.11, 2025.12.0, min dask)	5m 24s
test (ubuntu-latest, 3.11, latest)	4m 27s
test (windows-latest, 3.14, latest)	4m 10s
	22m 22s

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