GDScript: Fix autocompletion issues with nested types

modules/gdscript/tests/scripts/completion/class_a.notest.gd

@@ -1,5 +1,27 @@
 extends Node
 
+class InnerA:
+	class InnerInnerA:
+		enum EnumOfInnerInnerA {
+		ENUM_VALUE_1,
+		ENUM_VALUE_2,
+	}
+
+	enum EnumOfInnerA {
+		ENUM_VALUE_1,
+		ENUM_VALUE_2,
+	}
+
+	signal signal_of_inner_a
+	var property_of_inner_a
+	func func_of_inner_a():
+		pass
+
+enum EnumOfA {
+	ENUM_VALUE_1,
+	ENUM_VALUE_2,
+}
+
 signal signal_of_a
 
 var property_of_a