RFR: 8341257: Open source few DND tests - Set1

[Damon Nguyen]

Following tests are added as part of this PR:

1. /java/awt/dnd/NonAsciiFilenames/NonAsciiFilenames.java - MANUAL
2. /java/awt/dnd/DnDRemoveFocusOwnerCrashTest/DnDRemoveFocusOwnerCrashTest.java - AUTO
3. /java/awt/dnd/DnDToWordpadTest/DnDToWordpadTest.java - MANUAL
4. /java/awt/dnd/DnDCursorCrashTest/DnDCursorCrashTest.java - AUTO (Problem listed on MacOS only.)
5. /java/awt/dnd/DnDClipboardDeadlockTest/DnDClipboardDeadlockTest.java - AUTO (Problem listed on Linux only.)

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

Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/21394/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21394&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341257
  Stats: 1295 lines in 6 files changed: 1295 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21394.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21394/head:pull/21394

PR: https://git.openjdk.org/jdk/pull/21394