Fixes the grapheme break logic for consecutive `ZWJ`s under GB11 in Unicode Text Segmentation (UAX29). Also corrects an existing test case that incorrectly joined a `ZWJ` and a pictograph.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - initial commit Changes: https://git.openjdk.org/jdk/pull/33186/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33186&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8393247 Stats: 24 lines in 3 files changed: 7 ins; 0 del; 17 mod Patch: https://git.openjdk.org/jdk/pull/33186.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/33186/head:pull/33186 PR: https://git.openjdk.org/jdk/pull/33186
