RFR: 7903055: Replace `junit.jar` with `junit-platform-console-standalone` artifact [v2]

[Christian Stein]

> https://bugs.openjdk.java.net/browse/CODETOOLS-7903055

Christian Stein has updated the pull request incrementally with 17 additional commits since the last revision:

 - Merge branch 'openjdk:master' into 7903055-replace-junit4-with-junit5
 - 7903101: provide better documentation for jtreg test infrastructure
   
   Reviewed-by: iris
 - 7903096: remove old @author tags
   
   Reviewed-by: cstein, iris
 - 7903098: CODETOOLS-7903093 breaks some `basic` tests
   
   Reviewed-by: cstein
 - 7903093: Detect/report invalid class names given to @clean action
   
   Reviewed-by: jjg
 - 7903095: Use diamond operator in jtreg
   
   Reviewed-by: jjg
 - 7903091: Convert jtreg to use NIO
   
   Reviewed-by: iris
 - 7903044: Report `os.*` system properties in .jtr file
   
   Reviewed-by: jjg
 - 7903090: Merge othervm and agentvm classes; eliminate raw types
   
   Reviewed-by: iris
 - Update README.md
 - ... and 7 more: https://git.openjdk.java.net/jtreg/compare/be1c9023...3a15dcf5

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

Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/40/files
  - new: https://git.openjdk.java.net/jtreg/pull/40/files/be1c9023..3a15dcf5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=40&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=40&range=00-01

  Stats: 2059 lines in 108 files changed: 769 ins; 224 del; 1066 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/40.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/40/head:pull/40

PR: https://git.openjdk.java.net/jtreg/pull/40