[jdk17u-dev] RFR: 8306871: Open source more AWT Drag & Drop tests

[Victor Rudometov]

Backport https://github.com/openjdk/jdk/commit/b5a48277ab5b42c4b13db7ddb5418a17ada512ec
https://bugs.openjdk.org/browse/JDK-8306871 Open source more AWT Drag & Drop tests

Clean backport, new tests, low risk
Checked on macox x64, linux x64, all pass

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Commit messages:
 - Backport b5a48277ab5b42c4b13db7ddb5418a17ada512ec

Changes: https://git.openjdk.org/jdk17u-dev/pull/1353/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1353&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306871
  Stats: 1915 lines in 6 files changed: 1915 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1353.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1353/head:pull/1353

PR: https://git.openjdk.org/jdk17u-dev/pull/1353