Fix mouse events when physics_object_picking_first_only
enabled
#89643
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Fixes #89641
See issue for test project and reasoning. In my testing this change makes all the CollisionObject2D events (input, mouse_enter, mouse_exit, mouse_shape_enter, mouse_shape_exit) fire as expected.
The enter/exit events still fire continuously when sorting is OFF+first_only is ON, but this is expected and unavoidable (it's as if we're flipping rapidly and randomly between the stacked areas).