Refactor TestNG tests to JUnit under the umbrella initiative of [JDK-8307843](https://bugs.openjdk.org/browse/JDK-8307843). Fairly straight-forward mapping of annotations between the frameworks with some accommodations for differences in the Assert support.
------------- Commit messages: - 8373623: Refactor Serialization tests for Records to JUnit Changes: https://git.openjdk.org/jdk/pull/28804/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28804&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8373623 Stats: 431 lines in 20 files changed: 131 ins; 64 del; 236 mod Patch: https://git.openjdk.org/jdk/pull/28804.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/28804/head:pull/28804 PR: https://git.openjdk.org/jdk/pull/28804
