RFR: 8378111: Migrate java/util/jar tests to JUnit [v2]

[Justin Lu]

> This PR migrates the java/util/jar tests to use _JUnit_.
> 
> https://github.com/openjdk/jdk/commit/afe0aeee746bccbbe4bc6c9a8cd2302228ecc2f6 includes changes for _testNG_ based tests.
> https://github.com/openjdk/jdk/commit/c5a7f75840f96fa77ec3ed7faa713990adb84de6 includes changes for `main` based tests.
> 
> Before: Framework-based tests: 125 = 125 TestNG + 0 JUnit.
> After: Framework-based tests: 174 = 0 TestNG + 174 JUnit

Justin Lu has updated the pull request incrementally with three additional commits since the last revision:

 - Eirik comments
 - Naoto comment
 - Andrey comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/29828/files
  - new: https://git.openjdk.org/jdk/pull/29828/files/c5a7f758..c55c722d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29828&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29828&range=00-01

  Stats: 335 lines in 13 files changed: 148 ins; 125 del; 62 mod
  Patch: https://git.openjdk.org/jdk/pull/29828.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29828/head:pull/29828

PR: https://git.openjdk.org/jdk/pull/29828