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

[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).

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Commit messages:
 - 8366911: (fs) Remove support for normalizing file names to Unicode normalized form D (macOS)

Changes: https://git.openjdk.org/jdk/pull/27109/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27109&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366911
  Stats: 183 lines in 7 files changed: 2 ins; 174 del; 7 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