RFR: 8340790: Open source several AWT Dialog tests - Batch 4 [v4]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge Master
 - Problem list updated
 - Review updates
 - Updated review comments
 - Open source

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21404/files
  - new: https://git.openjdk.org/jdk/pull/21404/files/d68ab1f7..98b56bd9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21404&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21404&range=02-03

  Stats: 231151 lines in 1947 files changed: 207380 ins; 13471 del; 10300 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