Rollup merge of #142453 - ChrisDenton:fused, r=Amanieu

Windows: make `read_dir` stop iterating after the first error is encountered

This also essentially makes the `ReadDir` iterator fused. Which I think is pretty much what people expect anyway.

[`FindNextFileW`](https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-findnextfilew) doesn't document what happens if you call it after iteration ends or after an error so we're probably in implementation defined territory at that point.

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