RFR: JDK-8340555 : Open source DnD tests - Set4 [v8]

[Harshitha Onkar]

> Following tests are added as part of this PR:
> 
> 1. /java/awt/dnd/DnDHTMLToOutlookTest/DnDHTMLToOutlookTest.java - **Manual PassFailJFrame (PFJ) test**, problemlisted on all platforms.
> 
> 2. java/awt/dnd/DragSourceMotionListenerTest.java -  **Automated test**, problemlisted on windows
> 
> 3. /java/awt/dnd/DragToAnotherScreenTest.java - **Manual PFJ test**
> 
> 4. /java/awt/dnd/RejectDragTest.java - **Automated test**, problemlisted on macOS

Harshitha Onkar has updated the pull request incrementally with two additional commits since the last revision:

 - unused import
 - RejectDragTest

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21213/files
  - new: https://git.openjdk.org/jdk/pull/21213/files/b9f87ee6..202638e8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21213&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21213&range=06-07

  Stats: 8 lines in 2 files changed: 3 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/21213.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21213/head:pull/21213

PR: https://git.openjdk.org/jdk/pull/21213