### Godot version

v4.0.rc1.official [8843d9ad3]

### System information

Lubuntu

### Issue description

You can't use + or += to mutate typed arrays.

It seems to be not correctly getting the type information from the second operand.

An erudite poster on the discord puts it differently:
> it's more like operator + doesn't retain Array typing
> the syntax for Array Concatenation via operators, but the idea gets across i think


The error you see is:
```Trying to assign an array of type "Array" to a variable of type "Array[int]".```


### Steps to reproduce

```
	var Alice: Array[int] = [1,2,3]
	var Bob: Array[int] = [4,5,6]
	Alice += Bob
```
This will crash with the above error message.

### Minimal reproduction project

[plus_syntax_broken_demo_project.zip](https://github.com/godotengine/godot/files/10694514/plus_syntax_broken_demo_project.zip)

result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = p_property.type;
		if (p_property.type == Variant::ARRAY && p_property.hint == PROPERTY_HINT_ARRAY_TYPE) {
			
			StringName elem_type_name = p_property.hint_string;
			GDScriptParser::DataType elem_type;
			elem_type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
			Variant::Type elem_builtin_type = GDScriptParser::get_builtin_type(elem_type_name);
			if (elem_builtin_type < Variant::VARIANT_MAX) {
				
				elem_type.kind = GDScriptParser::DataType::BUILTIN;
				elem_type.builtin_type = elem_builtin_type;
			} else if (class_exists(elem_type_name)) {
				elem_type.kind = GDScriptParser::DataType::NATIVE;
				elem_type.builtin_type = Variant::OBJECT;
				elem_type.native_type = p_property.hint_string;
			} else if (ScriptServer::is_global_class(elem_type_name)) {
				
				Ref<Script> script = ResourceLoader::load(ScriptServer::get_global_class_path(elem_type_name));
				elem_type.kind = GDScriptParser::DataType::SCRIPT;
				elem_type.builtin_type = Variant::OBJECT;
				elem_type.native_type = script->get_instance_base_type();
				elem_type.script_type = script;
			} else {
				ERR_FAIL_V_MSG(result, "Could not find element type from property hint of a typed array.");
			}
			elem_type.is_constant = false;
			result.set_container_element_type(elem_type);
		} else if (p_property.type == Variant::INT) {