### 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)

GDScriptParser::DataType result = p_meta_type;
	result.is_meta_type = false;
	result.is_pseudo_type = false;
	if (p_meta_type.kind == GDScriptParser::DataType::ENUM) {
		result.builtin_type = Variant::INT;
	} else {
		result.is_constant = false;
	}
	return result;
}
GDScriptParser::DataType GDScriptAnalyzer::type_from_property(const PropertyInfo &p_property, bool p_is_arg, bool p_is_readonly) const {
	GDScriptParser::DataType result;
	result.is_read_only = p_is_readonly;
	result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	if (p_property.type == Variant::NIL && (p_is_arg || (p_property.usage & PROPERTY_USAGE_NIL_IS_VARIANT))) {
		
		result.kind = GDScriptParser::DataType::VARIANT;
		return result;
	}
	result.builtin_type = p_property.type;
	if (p_property.type == Variant::OBJECT) {
		result.kind = GDScriptParser::DataType::NATIVE;
		result.native_type = p_property.class_name == StringName() ? SNAME("Object") : p_property.class_name;
	} else {