Removed unused test/failure_handler/Makefile and updated README to remove the reference to it. - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).
------------- Commit messages: - 8382130: Remove test/failure_handler/Makefile Changes: https://git.openjdk.org/jdk/pull/30951/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30951&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8382130 Stats: 109 lines in 1 file changed: 0 ins; 109 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/30951.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30951/head:pull/30951 PR: https://git.openjdk.org/jdk/pull/30951
