Ensure that the CLDR test data for regions XA and XB does not leak out from `getDisplayCountry`.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - init Changes: https://git.openjdk.org/jdk/pull/33448/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33448&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8394753 Stats: 59 lines in 2 files changed: 52 ins; 0 del; 7 mod Patch: https://git.openjdk.org/jdk/pull/33448.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/33448/head:pull/33448 PR: https://git.openjdk.org/jdk/pull/33448
