Change test to use `RandomFactory` instead of `new Random()` and convert it to JUnit 5.
------------- Commit messages: - 8313621: Convert test to JUnit 5 - 8313621: test/jdk/jdk/internal/math/FloatingDecimal/TestFloatingDecimal should use RandomFactory Changes: https://git.openjdk.org/jdk/pull/16130/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16130&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8313621 Stats: 118 lines in 1 file changed: 11 ins; 78 del; 29 mod Patch: https://git.openjdk.org/jdk/pull/16130.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16130/head:pull/16130 PR: https://git.openjdk.org/jdk/pull/16130
