RFR: 8306466: Open source more AWT Drag & Drop related tests [v2]

[Damon Nguyen]

> 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:

  Remove extra folders

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13653/files
  - new: https://git.openjdk.org/jdk/pull/13653/files/78b086ac..5435c254

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13653&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13653&range=00-01

  Stats: 0 lines in 4 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13653.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13653/head:pull/13653

PR: https://git.openjdk.org/jdk/pull/13653