RFR: 8174269: Remove COMPAT locale data provider from JDK [v7]

[Joe Wang]

On Tue, 5 Mar 2024 17:50:09 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> 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:
> 
>   Reflects review comments

Marked as reviewed by joehw (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17991#pullrequestreview-1917852026