[XWayland] JavaFX tests that use AWT Robot fail on Wayland

tests/system/src/test/java/test/robot/javafx/embed/swing/SwingNodeJDialogTest.java . testNodeRemovalBeforeShow fails on Wayland even after resolving JDK-8326712 and JDK-8335468.


SwingNodeJDialogTest > testNodeRemovalBeforeShow FAILED
    java.lang.AssertionError: JDialog is above JavaFX stage
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.assertTrue(Assert.java:42)
        at org.junit.Assert.assertFalse(Assert.java:65)
        at test.robot.javafx.embed.swing.SwingNodeBase.testAbove(SwingNodeBase.java:208)
        at test.robot.javafx.embed.swing.SwingNodeJDialogTest.testNodeRemovalBeforeShow(SwingNodeJDialogTest.java:67)


Similarly, tests/system/src/test/java/test/robot/javafx/scene/SRGBTest.java fails on XWayland:

SRGBTest > sRGBPixelTest FAILED
    org.junit.runners.model.TestTimedOutException: test timed out after 15000 milliseconds
        at java.base/java.lang.Object.wait0(Native Method)
        at java.base/java.lang.Object.wait(Object.java:366)
        at java.base/java.lang.Object.wait(Object.java:339)
        at java.desktop/java.awt.EventQueue.invokeAndWait(EventQueue.java:1365)
        at java.desktop/java.awt.EventQueue.invokeAndWait(EventQueue.java:1346)
        at java.desktop/javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1480)
        at test.robot.javafx.scene.SRGBTest.getSRGBColorAtScreenCenter(SRGBTest.java:104)
        at test.robot.javafx.scene.SRGBTest.sRGBPixelTest(SRGBTest.java:225)