Can't import FXML files with <?language javascript?>

[jperedadnr]

Since JavaFX 20, importing an FXML file with <?language javascript?> fails with:

java.io.IOException: javafx.fxml.LoadException: JavaScript script engine is disabled.
/hello-script.fxml

	at [email protected]/com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.handleUnknownAndMissingCauses(FXOMLoader.java:119)
	at [email protected]/com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.handleFxmlLoadingError(FXOMLoader.java:114)
	at [email protected]/com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.load(FXOMLoader.java:106)
	at [email protected]/com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.<init>(FXOMDocument.java:119)
	at [email protected]/com.oracle.javafx.scenebuilder.kit.editor.EditorController.updateFxomDocument(EditorController.java:2520)
	at [email protected]/com.oracle.javafx.scenebuilder.kit.editor.EditorController.setFxmlTextAndLocation(EditorController.java:713)
	at [email protected]/com.oracle.javafx.scenebuilder.app.DocumentWindowController.loadFromFile(DocumentWindowController.java:405)
	at [email protected]/com.oracle.javafx.scenebuilder.app.SceneBuilderApp.performOpenFiles(SceneBuilderApp.java:739)
	at [email protected]/com.oracle.javafx.scenebuilder.app.SceneBuilderApp.handleOpenFilesAction(SceneBuilderApp.java:538)
	at [email protected]/com.oracle.javafx.scenebuilder.app.welcomedialog.WelcomeDialogWindowController.openFilesAndHideStage(WelcomeDialogWindowController.java:315)
	at [email protected]/com.oracle.javafx.scenebuilder.app.welcomedialog.WelcomeDialogWindowController.attemptOpenExistingFiles(WelcomeDialogWindowController.java:308)
	at [email protected]/com.oracle.javafx.scenebuilder.app.welcomedialog.WelcomeDialogWindowController.handleOpen(WelcomeDialogWindowController.java:350)
	at [email protected]/com.oracle.javafx.scenebuilder.app.welcomedialog.WelcomeDialogWindowController.handleOpen(WelcomeDialogWindowController.java:291)
	at [email protected]/com.oracle.javafx.scenebuilder.app.welcomedialog.WelcomeDialogWindowController.fireOpenRecentProject(WelcomeDialogWindowController.java:239)
	at [email protected]/com.oracle.javafx.scenebuilder.app.welcomedialog.WelcomeDialogWindowController.lambda$loadAndPopulateRecentItemsInBackground$6(WelcomeDialogWindowController.java:200)
	at [email protected]/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
	at [email protected]/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:232)
	at [email protected]/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:189)
	at [email protected]/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at [email protected]/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
...
Caused by: javafx.fxml.LoadException: JavaScript script engine is disabled.
/hello-script.fxml

	at [email protected]/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2723)
	at [email protected]/javafx.fxml.FXMLLoader.processLanguage(FXMLLoader.java:2810)
	at [email protected]/javafx.fxml.FXMLLoader.processProcessingInstruction(FXMLLoader.java:2776)
	at [email protected]/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2644)
	at [email protected]/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2552)
	at [email protected]/com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.load(FXOMLoader.java:104)
	... 67 more

As per https://openjfx.io/javadoc/23/javafx.fxml/javafx/fxml/doc-files/introduction_to_fxml.html#scripting
Scene Builder needs to run with
-Djavafx.allowjs=true

The same applies to the test that was modified in #619:

https://github.com/gluonhq/scenebuilder/pull/619/files#diff-fcff3bec73ef52f202e23cb21a1e0fd095b82bf66b6940fa5ed5b7165fc159bdL3

Reverting this change will work passing the same -Djavafx.allowjs=true to the surefire <argLine/>.