[jdk24u] RFR: 8344581: [TESTBUG] java/awt/Robot/ScreenCaptureRobotTest.java failing on macOS

[Naveen Narayanan]

Improve the 'java/awt/Robot/ScreenCaptureRobotTest.java' to cover the MacOS failure scenarios.

This pull request contains a backport of commit [e4c22a4](https://git.openjdk.org/jdk/commit/0d30b869d8be831bfc5ff5511b3a42900e4c22a4) 
from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

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

Commit messages:
 - Backport 0d30b869d8be831bfc5ff5511b3a42900e4c22a4

Changes: https://git.openjdk.org/jdk24u/pull/106/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=106&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344581
  Stats: 14 lines in 2 files changed: 12 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk24u/pull/106.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/106/head:pull/106

PR: https://git.openjdk.org/jdk24u/pull/106