RFR: JDK-8340978 : Open source few DnD tests - Set6

[Harshitha Onkar]

Following two tests are open-sourced:

1. 	test/jdk/java/awt/dnd/CustomDragCursorTest.java - Automated, Problemlisted on macOS
2. 	test/jdk/java/awt/dnd/DnDAcceptanceTest/DnDAcceptanceTest.java - Manual

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Commit messages:
 - EOF newline
 - DnD tests - Set 6

Changes: https://git.openjdk.org/jdk/pull/21342/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21342&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340978
  Stats: 695 lines in 6 files changed: 695 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21342.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21342/head:pull/21342

PR: https://git.openjdk.org/jdk/pull/21342