RFR: 8340790: Open source several AWT Dialog tests - Batch 4 [v3]

[Tejesh R]

> Open source these AWT Dialog tests:
> 
> java/awt/Dialog/FileDialogGetFileTest.java
> java/awt/Dialog/EnabledResetTest.java
> java/awt/Dialog/ChoiceModalDialogTest.java
> java/awt/Dialog/DialogBackgroundTest.java

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Review updates

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21404/files
  - new: https://git.openjdk.org/jdk/pull/21404/files/e8612332..d68ab1f7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21404&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21404&range=01-02

  Stats: 22 lines in 1 file changed: 12 ins; 10 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21404.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21404/head:pull/21404

PR: https://git.openjdk.org/jdk/pull/21404