RFR: 8316306: Open source and convert manual Swing test [v2]

[Damon Nguyen]

> This is to convert and open source test: javax/swing/JToolBar/4203039/bug4203039.java 
> 
> This manual test now uses PassFailJFrame to handle the display for the instructions text as well as the pass/fail buttons.

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Review comments changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15806/files
  - new: https://git.openjdk.org/jdk/pull/15806/files/13ff5052..b6ae9b98

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15806&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15806&range=00-01

  Stats: 9 lines in 1 file changed: 2 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/15806.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15806/head:pull/15806

PR: https://git.openjdk.org/jdk/pull/15806