RFR: 8315484: java/awt/dnd/RejectDragDropActionTest.java timed out

[Damon Nguyen]

This test intermittently fails by timeout. Increasing the timeout alone doesn't solve the failure as it still fails in about 400 runs. Adding another delay and reducing the delay amount to 1000ms. Now, the test passes after 2 sets of 500 repeats on all OS's without a timeout.

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Commit messages:
 - Update for stability. Add delay and timeout.

Changes: https://git.openjdk.org/jdk/pull/16018/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16018&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315484
  Stats: 14 lines in 1 file changed: 5 ins; 2 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/16018.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16018/head:pull/16018

PR: https://git.openjdk.org/jdk/pull/16018