RFR: 8368165: (fs) Path.toRealPath does not perform correctly for symbolic links in a mapped drive (win)

[Brian Burkhalter]

If `getFinalPath` throws an exception, or converts a drive path to a UNC path, then fall back to the slow path which uses `resolveAllLinks`.

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Commit messages:
 - 8368165: (fs) Path.toRealPath does not perform correctly for symbolic links in a mapped drive (win)

Changes: https://git.openjdk.org/jdk/pull/28032/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28032&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368165
  Stats: 24 lines in 1 file changed: 18 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/28032.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28032/head:pull/28032

PR: https://git.openjdk.org/jdk/pull/28032