Add more integration tests to the GDScript test suite

This also fixes a typo in the `bitwise_float_right_operand.gd` test.

modules/gdscript/tests/scripts/parser/features/lambda_capture_callable.gd

@@ -0,0 +1,4 @@
+func test():
+	var x = 42
+	var my_lambda = func(): print(x)
+	my_lambda.call() # Prints "42".