RFR: 8307299: Move more DnD tests to open

[Alisen Chung]

Added DnD tests

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

Commit messages:
 - added DnD tests

Changes: https://git.openjdk.org/jdk/pull/13759/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13759&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307299
  Stats: 1776 lines in 6 files changed: 1776 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13759.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13759/head:pull/13759

PR: https://git.openjdk.org/jdk/pull/13759