RFR: 8306466: Open source more AWT Drag & Drop related tests [v3]

[Phil Race]

On Fri, 28 Apr 2023 14:56:25 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> This PR open sources a few more AWT DnD related tests
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix review comments

Marked as reviewed by prr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13653#pullrequestreview-1406642007