RFR: 8307299: Move more DnD tests to open

[Phil Race]

On Tue, 2 May 2023 18:12:38 GMT, Alisen Chung <achung at openjdk.org> wrote:

> Added DnD tests

Marked as reviewed by prr (Reviewer).

test/jdk/java/awt/dnd/DropTargetingTest.java line 25:

> 23: 
> 24: import javax.swing.JButton;
> 25: import javax.swing.JFrame;

This isn't important and I noticed the same on the other PR I just looked at, but generally
we'd list javax.* APIs after the java.* APIs 

But it isn't 100% alphabetical as I'd put all the "java.base" APIs first ... not relevant here tho'

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PR Review: https://git.openjdk.org/jdk/pull/13759#pullrequestreview-1409708013
PR Review Comment: https://git.openjdk.org/jdk/pull/13759#discussion_r1182932768