RFR: 8306681: Open source more AWT DnD related tests [v2]

[Sergey Bylokhov]

On Wed, 26 Apr 2023 22:48:24 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> This PR open sources more AWT DnD related tests
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add endline

Marked as reviewed by serb (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/13674#pullrequestreview-1403059300