RFR: 8373623: Refactor Serialization tests for Records to JUnit

[Justin Lu]

On Fri, 12 Dec 2025 21:38:16 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> 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.

Did not spot any issues with the refactoring.

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Marked as reviewed by jlu (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28804#pullrequestreview-3579630820