RFR: 8354900: javax/swing/AbstractButton/bug4133768.java failing on macosx-aarch64

[Jayathirth D V]

javax/swing/AbstractButton/bug4133768.java was automated and open-sourced recently and it fails intermittently in CI.

Looks like when we have mouse pointer at same location from where we are picking UI color from robot, it picks wrong color.

Updated test to have mouse pointer to be at different place from where we are picking roll-over color of buttons.
Also made other changes to make test more robust. With all these changes test now passes all the time in CI.

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Commit messages:
 - 8354900: javax/swing/AbstractButton/bug4133768.java failing on macosx-aarch64

Changes: https://git.openjdk.org/jdk/pull/24712/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24712&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354900
  Stats: 29 lines in 1 file changed: 18 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/24712.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24712/head:pull/24712

PR: https://git.openjdk.org/jdk/pull/24712