### 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)

r_return_type = type_from_property(p_info.return_val);
	r_default_arg_count = p_info.default_arguments.size();
	r_method_flags = p_info.flags;
	for (const PropertyInfo &E : p_info.arguments) {
		r_par_types.push_back(type_from_property(E, true));
	}
	return true;
}
void GDScriptAnalyzer::validate_call_arg(const MethodInfo &p_method, const GDScriptParser::CallNode *p_call) {
	List<GDScriptParser::DataType> arg_types;
	for (const PropertyInfo &E : p_method.arguments) {
		arg_types.push_back(type_from_property(E, true));
	}
	validate_call_arg(arg_types, p_method.default_arguments.size(), (p_method.flags & METHOD_FLAG_VARARG) != 0, p_call);
}
void GDScriptAnalyzer::validate_call_arg(const List<GDScriptParser::DataType> &p_par_types, int p_default_args_count, bool p_is_vararg, const GDScriptParser::CallNode *p_call) {
	if (p_call->arguments.size() < p_par_types.size() - p_default_args_count) {
		push_error(vformat(R"*(Too few arguments for "%s()" call. Expected at least %d but received %d.)*", p_call->function_name, p_par_types.size() - p_default_args_count, p_call->arguments.size()), p_call);
	}
	if (!p_is_vararg && p_call->arguments.size() > p_par_types.size()) {
		push_error(vformat(R"*(Too many arguments for "%s()" call. Expected at most %d but received %d.)*", p_call->function_name, p_par_types.size(), p_call->arguments.size()), p_call->arguments[p_par_types.size()]);
	}
	for (int i = 0; i < p_call->arguments.size(); i++) {
		if (i >= p_par_types.size()) {