<i18n dev> RFR: 8357075: Remove leftover COMPAT locale data tests

[Naoto Sato]

Removing now-defunct COMPAT locale provider tests.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/25257/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25257&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357075
  Stats: 8496 lines in 2 files changed: 0 ins; 8484 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/25257.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25257/head:pull/25257

PR: https://git.openjdk.org/jdk/pull/25257