RFR: 8366911: (fs) Remove support for normalizing file names to Unicode normalized form D (macOS) [v2]

[Brian Burkhalter]

> Remove all code for normalizing file paths to Unicode Normalization Format D on macOS. This removes support for the system property `jdk.nio.path.useNormalizationFormD`. This change nullifies the effect of the change made for [JDK-8289689](https://bugs.openjdk.org/browse/JDK-8289689).

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

  8366911: Remove MacPathTest; tweak MacPath; UnixPath.stringValue -> stable

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27109/files
  - new: https://git.openjdk.org/jdk/pull/27109/files/9f27ffb2..40aadb21

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27109&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27109&range=00-01

  Stats: 93 lines in 3 files changed: 16 ins; 72 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27109.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27109/head:pull/27109

PR: https://git.openjdk.org/jdk/pull/27109