RFR: 8307297: Move some DnD tests to open [v6]

[Alisen Chung]

> Adding some DnD tests

Alisen Chung has updated the pull request incrementally with two additional commits since the last revision:

 - remove extra robot waits causing timeouts
 - fix test timeout

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13756/files
  - new: https://git.openjdk.org/jdk/pull/13756/files/1292a6a5..257c49d4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13756&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13756&range=04-05

  Stats: 6 lines in 2 files changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13756.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13756/head:pull/13756

PR: https://git.openjdk.org/jdk/pull/13756