RFR: 8356145: ListEnterExitTest.java fails on macos

[Abhishek Kumar]

Test was failing on macOS 14.7.1 system in CI pipeline. Logged output suggests that the mouse exit event is not triggered and thus the test fails.
Increased number of list items and adjusted the X and Y offset for mouse move events, so the mouse pointer will be within the frame and added robot delay to stabilize the test.

Verified the updated test in CI on macOS 14.7 machine and there is no failure.

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Commit messages:
 - Test Stabilization

Changes: https://git.openjdk.org/jdk/pull/25299/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25299&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356145
  Stats: 17 lines in 1 file changed: 12 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/25299.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25299/head:pull/25299

PR: https://git.openjdk.org/jdk/pull/25299