[jdk17u-dev] RFR: 8306133: Open source few AWT Drag & Drop related tests

[Victor Rudometov]

Clean backport, new tests, low risk
Checked on macOS x64, linux x64, windows x64: tests pass

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

Commit messages:
 - Backport ec5c7926f3cea68bf0d0ceb460a8383f5e4ea278

Changes: https://git.openjdk.org/jdk17u-dev/pull/1366/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1366&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306133
  Stats: 1061 lines in 5 files changed: 1061 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1366.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1366/head:pull/1366

PR: https://git.openjdk.org/jdk17u-dev/pull/1366