RFR: 8364277: (fs) BasicFileAttributes.isDirectory and isOther return true for NTFS directory junctions when links not followed

[Brian Burkhalter]

Change `BasicFileAttributes` for Windows such that for a directory junction `isOther` returns `true` but all other `is*` methods return `false`. Without this change, `isDirectory` also returns `true`.

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Commit messages:
 - 8364277: Add sub-test to existing test
 - 8364277: (fs) BasicFileAttributes.isDirectory and isOther return true for NTFS directory junctions when links not followed

Changes: https://git.openjdk.org/jdk/pull/26631/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26631&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364277
  Stats: 218 lines in 4 files changed: 206 ins; 1 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/26631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26631/head:pull/26631

PR: https://git.openjdk.org/jdk/pull/26631