Perform hidden file check on relative data file path
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['_The documentation is not available anymore as the PR was closed or merged._'
 "I'm aware of this behavior, which is tricky to solve due to fsspec's hidden file handling (see https://github.com/huggingface/datasets/issues/4115#issuecomment-1108819538). I've tested some regex patterns to address this, and they seem to work (will push them on Monday; btw they don't break any of fsspec's tests, so maybe we can contribute this as an enhancement to them). Also, perhaps we should include the files starting with `__`  in the results again (we hadn't had issues with this pattern before). WDYT?"
 "I see. Feel free to merge this one if it's good for you btw :)\r\n\r\n> Also, perhaps we should include the files starting with __ in the results again (we hadn't had issues with this pattern before)\r\n\r\nThe point was mainly to ignore `__pycache__` directories for example. Also also for consistency with the iter_files/iter_archive which are already ignoring them"
 'Very elegant solution! Feel free to merge if the CI is green after adding the tests.'
 'CI failure is unrelated to this PR']
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Fix #4549 
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