RFR: 8375712: Convert java/lang/runtime tests to use JUnit [v3]

[Jan Lahoda]

> This PR converts the tests under `test/jdk/java/lang/runtime/` to use JUnit. Mostly converted by the automatic conversion tool, but there's a manual tweak to use `assertThrows` instead of the current manual `try-catch`. Also one manual fix. The changes are in separate commits, which should help reviewing.
> 
> Thanks!

Jan Lahoda has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Updating per review comments.
 - Merge remote-tracking branch 'upstream/master' into upgrade-java-lang-runtime-to-junit
 - Removing wrong @Test annotation.
 - Using assertThrows instead of manual try-catch.
 - 8375712: Convert java/lang/runtime tests to use JUnit
   (automatic conversion)
 - Cleanup.
 - 8375119: SwitchBoostraps.enumSwitch does not throw an NPE when lookup is null in some cases

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Changes: https://git.openjdk.org/jdk/pull/29350/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29350&range=02
  Stats: 243 lines in 3 files changed: 33 ins; 101 del; 109 mod
  Patch: https://git.openjdk.org/jdk/pull/29350.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29350/head:pull/29350

PR: https://git.openjdk.org/jdk/pull/29350