GH-128520: pathlib ABCs: fix with_name() handling of empty names
#130964
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Raise `ValueError` from `pathlib.types._JoinablePath.with_name()` when given an empty name, or acting upon a path with an empty name. This behaviour matches `pathlib.PurePath.with_name()`.
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Raise
ValueErrorfrompathlib.types._JoinablePath.with_name()when given an empty name, or acting upon a path with an empty name. This behaviour matchespathlib.PurePath.with_name().