### 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)

for (const KeyValue<StringName, int64_t> &E : p_type.enum_values) {
		if (E.value == p_value) {
			return true;
		}
	}
	return false;
}
#endif
void GDScriptAnalyzer::update_const_expression_builtin_type(GDScriptParser::ExpressionNode *p_expression, const GDScriptParser::DataType &p_type, const char *p_usage, bool p_is_cast) {
	if (p_expression->get_datatype() == p_type) {
		return;
	}
	if (p_type.kind != GDScriptParser::DataType::BUILTIN && p_type.kind != GDScriptParser::DataType::ENUM) {
		return;
	}
	GDScriptParser::DataType expression_type = p_expression->get_datatype();
	bool is_enum_cast = p_is_cast && p_type.kind == GDScriptParser::DataType::ENUM && p_type.is_meta_type == false && expression_type.builtin_type == Variant::INT;
	if (!is_enum_cast && !is_type_compatible(p_type, expression_type, true, p_expression)) {
		push_error(vformat(R"(Cannot %s a value of type "%s" as "%s".)", p_usage, expression_type.to_string(), p_type.to_string()), p_expression);
		return;
	}
	GDScriptParser::DataType value_type = type_from_variant(p_expression->reduced_value, p_expression);