8361193: Test java/awt/Mixing/AWT_Mixing/MixingPanelsResizing.java fails on MacOS X

[kboulanou]

Sets setOpaque for lightweight, and uses a compares colors with tolerance in MacOS X machines.

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Integration blocker

 ⚠️ Dependency #25971 must be integrated first

Issue

• JDK-8361193: Test java/awt/Mixing/AWT_Mixing/MixingPanelsResizing.java fails on MacOS X (Sub-task - P4)

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