Fix SCRIPT ERROR/ERROR/WARNING on test output

Also "fixing" some GDScript completion tests which
where named wrongly.

modules/gdscript/tests/scripts/completion/get_node/local_inferred/local_inferred.cfg

@@ -0,0 +1,7 @@
+[output]
+include=[
+    ; Node
+    {"display": "add_child(…)"},
+    {"display": "owner"},
+    {"display": "child_entered_tree"},
+]

modules/gdscript/tests/scripts/completion/get_node/local_inferred/local_inferred.gd

@@ -0,0 +1,6 @@
+extends Node
+
+func a():
+    var test := $AnimationPlayer
+    test.➡
+    pass