[jdk17u-dev] RFR: 8306941: Open source several datatransfer and dnd AWT tests

[Victor Rudometov]

Backport  https://github.com/openjdk/jdk/commit/3d3eaed9133dbe728ca8e00a626d33f7e35ba9ff
https://bugs.openjdk.org/browse/JDK-8306941 Open source several datatransfer and dnd AWT tests

Clean backport, new tests, low risk
Checked on macos, linux x64, all passed

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Commit messages:
 - Backport 3d3eaed9133dbe728ca8e00a626d33f7e35ba9ff

Changes: https://git.openjdk.org/jdk17u-dev/pull/1355/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1355&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306941
  Stats: 831 lines in 4 files changed: 831 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1355.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1355/head:pull/1355

PR: https://git.openjdk.org/jdk17u-dev/pull/1355