<i18n dev> RFR: 8358089: GenerateKeyList.java COMPAT removal update

[Justin Lu]

Please review this PR which updates the test tool `GenerateKeyList.java` after the COMPAT locale data removal.

`LocaleDataTest.java` may optionally use the `GenerateKeyList.java` tool; the latter requires similar bundle name changes that were made to the former in https://bugs.openjdk.org/browse/JDK-8357075.

Additionally, the CollationData bundle name needs to be adjusted to properly retrieve its contents. This was not previously exposed because `LocaleData.cldr` does not contain any CollationData entries.

We may also want to consider moving `GenerateKeyList.java` into the same space as `LocaleDataTest.java`.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/25527/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25527&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358089
  Stats: 19 lines in 2 files changed: 7 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/25527.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25527/head:pull/25527

PR: https://git.openjdk.org/jdk/pull/25527