RFR: 8339982: Open source several AWT Mouse tests - Batch 2 [v3]

[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 one additional commit since the last revision:

  Review comments updated

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21126/files
  - new: https://git.openjdk.org/jdk/pull/21126/files/d2bd742e..6c274e31

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21126&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21126&range=01-02

  Stats: 120 lines in 1 file changed: 21 ins; 93 del; 6 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