This is a followup from https://github.com/openjdk/jdk/pull/29850, this time converting all (but one) TestNG tests under `test/jdk/java/net/httpclient/http3/` to use JUnit
------------- Commit messages: - 8378565: Refactor test/jdk/java/net/httpclient/http3/*.java TestNG tests to JUnit Changes: https://git.openjdk.org/jdk/pull/29893/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29893&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8378565 Stats: 589 lines in 28 files changed: 99 ins; 84 del; 406 mod Patch: https://git.openjdk.org/jdk/pull/29893.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29893/head:pull/29893 PR: https://git.openjdk.org/jdk/pull/29893
