RFR: 8313613: Use JUnit in langtools/lib tests [v2]

[Qing Xiao]

> Use JUnit Jupiter API in langtools/lib tests instead of TestNG. They are under test/langtools/lib/combo/tools/javac/combo/.
> Modified tests that extend tools in CompilationTestCase and JavacTemplateTestBase to implement TestWatcher.

Qing Xiao has updated the pull request incrementally with one additional commit since the last revision:

  remove unused JavacTemplateDiagnosticsPrinter.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15281/files
  - new: https://git.openjdk.org/jdk/pull/15281/files/81326627..5f9f0f60

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15281&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15281&range=00-01

  Stats: 58 lines in 1 file changed: 0 ins; 58 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15281.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15281/head:pull/15281

PR: https://git.openjdk.org/jdk/pull/15281