<i18n dev> RFR: 8174269: Remove COMPAT locale data provider from JDK [v3]

[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.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Remove `GensrcLocaleData.gmk`

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17991/files
  - new: https://git.openjdk.org/jdk/pull/17991/files/270afef5..f68df434

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17991&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17991&range=01-02

  Stats: 71 lines in 3 files changed: 0 ins; 70 del; 1 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