RFR: 8376234: Migrate java/lang/constant tests away from TestNG

[Chen Liang]

Convert all TestNG tests in java/lang/constant to JUnit tests.

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Commit messages:
 - Bugs in migration
 - No testng in constant

Changes: https://git.openjdk.org/jdk/pull/29396/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29396&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376234
  Stats: 732 lines in 15 files changed: 140 ins; 317 del; 275 mod
  Patch: https://git.openjdk.org/jdk/pull/29396.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29396/head:pull/29396

PR: https://git.openjdk.org/jdk/pull/29396