GDScript: Improve call analysis

* Add missing `UNSAFE_CALL_ARGUMENT` warning.
* Fix `Object` constructor.
* Display an error for non-existent static methods.

modules/gdscript/tests/scripts/runtime/features/object_constructor.gd

@@ -0,0 +1,6 @@
+# GH-73213
+
+func test():
+	var object := Object.new() # Not `Object()`.
+	print(object.get_class())
+	object.free()

modules/gdscript/tests/scripts/runtime/features/object_constructor.out

@@ -0,0 +1,2 @@
+GDTEST_OK
+Object

modules/gdscript/tests/scripts/runtime/features/standalone-calls-do-not-write-to-nil.gd

@@ -12,6 +12,7 @@ func test():
 	print("end")
 
 func test_construct(v, f):
+	@warning_ignore("unsafe_call_argument")
 	Vector2(v, v) # Built-in type construct.
 	assert(not f) # Test unary operator reading from `nil`.
 

modules/gdscript/tests/scripts/runtime/features/static_variables.gd

@@ -44,6 +44,7 @@ func test():
 
 	@warning_ignore("unsafe_method_access")
 	var path = get_script().get_path().get_base_dir()
+	@warning_ignore("unsafe_call_argument")
 	var other = load(path + "/static_variables_load.gd")
 
 	prints("load.perm:", other.perm)

modules/gdscript/tests/scripts/runtime/features/stringify.gd

@@ -24,7 +24,8 @@ func test():
 	print(StringName("hello"))
 	print(NodePath("hello/world"))
 	var node := Node.new()
-	print(RID(node))
+	@warning_ignore("unsafe_call_argument")
+	print(RID(node)) # TODO: Why is the constructor (or implicit cast) not documented?
 	print(node.get_name)
 	print(node.property_list_changed)
 	node.free()