Change GDScript tests to use InstancePlaceholder as the example abstract class #79524
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This PR is split off from #67510 for easy reviewing.
It changes the GDScript tests to use InstancePlaceholder as the example abstract class instead of CanvasItem, since I want to allow extending CanvasItem. Why InstancePlaceholder: somewhat arbitrary, out of the current abstract classes this seems like a class that nobody would ever want to extend.
Also, this PR includes some formatting fixes in
canvas_item.h
.