RFR: 8364277: (fs) BasicFileAttributes.isDirectory and isOther return true for NTFS directory junctions when links not followed [v2]

[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`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8364277: 1) Add and use package scope isDirectoryJunction(); 2) Remove explicit delete of junction from test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26631/files
  - new: https://git.openjdk.org/jdk/pull/26631/files/c5794766..cf9eab46

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26631&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26631&range=00-01

  Stats: 12 lines in 3 files changed: 8 ins; 3 del; 1 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