RFR: 8341257: Open source few DND tests - Set1 [v4]

[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.)

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Review comments again

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21394/files
  - new: https://git.openjdk.org/jdk/pull/21394/files/9651e649..2c124458

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21394&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21394&range=02-03

  Stats: 10 lines in 4 files changed: 2 ins; 0 del; 8 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