[jdk17u-dev] RFR: 8307299: Move more DnD tests to open

[Chad Rakoczy]

Backport for [JDK-8307299](https://bugs.openjdk.org/browse/JDK-8307299)
Move more DnD tests to open
Clean test-only backport
New tests all pass
tier1 tested with GHA
tier2 tested on linux

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Commit messages:
 - Backport 950c5df859c373864ab4e7cf080c38bbd501e54b

Changes: https://git.openjdk.org/jdk17u-dev/pull/1532/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1532&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307299
  Stats: 1780 lines in 6 files changed: 1780 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1532.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1532/head:pull/1532

PR: https://git.openjdk.org/jdk17u-dev/pull/1532