Rollup merge of #101260 - ChrisDenton:attribute-tag, r=thomcc

Use `FILE_ATTRIBUTE_TAG_INFO` to get reparse tag

I've been looking at this code recently and it just occurred to me we don't actually use the full reparse data at this point, only the tag. [`GetFileInformationByHandleEx`](https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-getfileinformationbyhandleex) can do exactly that by filling a [`FILE_ATTRIBUTE_TAG_INFO`](https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-file_attribute_tag_info) struct.

r? ```````@thomcc``````` since you've made changes here recently (which is why I have this code on my mind atm)

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