path/filepath: try GetFinalPathNameByHandle with VOLUME_NAME_GUID

[ericwj]

EvalSymLinks calls into normaliseLinkPath, which will now also use GetFinalPathNameByHandle with VOLUME_NAME_GUID to resolve reparse points to paths.

Fixes #39786

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patch through code review.

Most changes in the Go project go through a few rounds of revision. This can be
surprising to people new to the project. The careful, iterative review process
is our way of helping mentor contributors and ensuring that their contributions
have a lasting impact.

During May-July and Nov-Jan the Go project is in a code freeze, during which
little code gets reviewed or merged. If a reviewer responds with a comment like
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reviewed as part of the next development cycle. See https://golang.org/s/release
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