RFR: 8307299: Move more DnD tests to open [v4]

[Sergey Bylokhov]

On Tue, 9 May 2023 17:54:41 GMT, Alisen Chung <achung at openjdk.org> wrote:

>> Added DnD tests
>
> Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix space, add method on EDT

Looks fine, please confirm march5 is green.

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Marked as reviewed by serb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13759#pullrequestreview-1427411634