[Data] Hard deprecate BlockWritePathProvider

[bveeramani]

Why are these changes needed?

We soft deprecated BlockWritePathProvider in favor of FilenameProvider in Ray 2.9 because FilenameProvider is simpler to use and allows you to configure filenames for row-based writes (e.g., images). This PR hard deprecates BlockWritePathProvider for Ray 2.10 and removes dead code.

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