RFR: 8320342: Use PassFailJFrame for TruncatedPopupMenuTest.java [v2]

[Rajat Mahajan]

> Modified the test to use PassFailJFrame and open sourced it.
> The test shows two windows, one for instructions and the other to perform testing on.
> Tested locally and it works fine.

Rajat Mahajan has updated the pull request incrementally with two additional commits since the last revision:

 - Update test/jdk/java/awt/PopupMenu/TruncatedPopupMenuTest.java
   
   Co-authored-by: Alexey Ivanov <alexey.ivanov at oracle.com>
 - Update test/jdk/java/awt/PopupMenu/TruncatedPopupMenuTest.java
   
   Co-authored-by: Alexey Ivanov <alexey.ivanov at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17641/files
  - new: https://git.openjdk.org/jdk/pull/17641/files/6c021d98..f3d5308c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17641&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17641&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17641.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17641/head:pull/17641

PR: https://git.openjdk.org/jdk/pull/17641