RFR: 8339982: Open source several AWT Mouse tests - Batch 2 [v2]

[Tejesh R]

> Open source these AWT Mouse and GraphicsEnvironment tests:
> 
> java/awt/MouseClickCount/MouseClickCount.java
> java/awt/MouseDragEnterExitTest/MouseDragEnterExitTest.java
> java/awt/MouseDragTest/MouseDragTest.java
> java/awt/OpenWinDoubleClickTest/OpenWinDoubleClickTest.java
> java/awt/GraphicsEnvironment/DefaultScreenDeviceTest.java

Tejesh R has updated the pull request incrementally with two additional commits since the last revision:

 - Renamed OpenWinDoubleClickTest to DoubleClickTest
 - jtreg updates

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21126/files
  - new: https://git.openjdk.org/jdk/pull/21126/files/0f491e0c..d2bd742e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21126&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21126&range=00-01

  Stats: 8 lines in 5 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/21126.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21126/head:pull/21126

PR: https://git.openjdk.org/jdk/pull/21126