RFR: 8329667: [macos] Issue with JTree related fix for JDK-8317771

[Alexander Zuev]

Caching children and selected children of the thee on the native level;
Caching all children of a specific parent in CAccessibility to enhance recursive children selection algorithm;
Removing fix for JDK-8317771 as no longer needed;

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Commit messages:
 - 8329667: [macos] Issue with JTree related fix for JDK-8317771

Changes: https://git.openjdk.org/jdk/pull/19255/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19255&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329667
  Stats: 151 lines in 4 files changed: 80 ins; 62 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/19255.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19255/head:pull/19255

PR: https://git.openjdk.org/jdk/pull/19255