RFR: 8307297: Move some DnD tests to open [v2]

[Sergey Bylokhov]

On Tue, 2 May 2023 20:57:28 GMT, Alisen Chung <achung at openjdk.org> wrote:

>> Adding some DnD tests
>
> Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   added space after if, moved some function calls on EDT

Looks fine, please confirm that mach5 is green.

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Marked as reviewed by serb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13756#pullrequestreview-1412325845