RFR: 8174269: Remove COMPAT locale data provider from JDK

[Naoto Sato]

This PR intends to remove the legacy `COMPAT` locale data from the JDK. The `COMPAT` locale data was introduced for applications' migratory purposes transitioning to `CLDR`. It is becoming a technical debt and now is the time to remove it (we've been emitting a warning at JVM startup since JDK21, if the app is using `COMPAT`). A corresponding CSR has also been drafted.

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Commit messages:
 - cleanup
 - BreakIteratorProvider available locales fix
 - clean-up
 - test fixes
 - makeZoneData.pl fix
 - Vanguard fix
 - test fixes
 - tz fixes
 - Specification changes
 - Restoring a test
 - ... and 29 more: https://git.openjdk.org/jdk/compare/b419e951...f3db6099

Changes: https://git.openjdk.org/jdk/pull/17991/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17991&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8174269
  Stats: 67652 lines in 566 files changed: 478 ins; 66408 del; 766 mod
  Patch: https://git.openjdk.org/jdk/pull/17991.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17991/head:pull/17991

PR: https://git.openjdk.org/jdk/pull/17991