RFR: 8307299: Move more DnD tests to open [v6]

[Alisen Chung]

> Added DnD tests

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  fix test timeout

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13759/files
  - new: https://git.openjdk.org/jdk/pull/13759/files/6ef6c730..faca0092

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13759&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13759&range=04-05

  Stats: 51 lines in 2 files changed: 12 ins; 12 del; 27 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