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fs: make
FileHandle.readableWebStream
always create byte streams
The original implementation of the experimental `FileHandle.readableWebStream` API created non-`type: 'bytes'` streams, which prevented callers from creating `mode: 'byob'` readers from the returned stream, which means they could not achieve the associated "zero-copy" performance characteristics. Then, #46933 added a parameter allowing callers to pass the `type` parameter down to the ReadableStream constructor, exposing the same semantics to callers of `FileHandle.readableWebStream`. But there is no point to giving callers this choice: FileHandle-derived streams are by their very nature byte streams. We should not require callers to explicitly opt in to having byte stream semantics. Moreover, I do not see a situation in which callers would ever want to have a non-bytes stream: bytes-streams only do anything differently than normal ones if `mode: 'byob'` is passed to `getReader`. So, remove the `options` parameter and always create a ReadableStream with `type: 'bytes'`. Fixes #54041.
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