### 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)

static void evaluate(const Variant &p_left, const Variant &p_right, Variant *r_ret, bool &r_valid) {                 \
			*r_ret = m_op(_operate_get_##m_left(&p_left), _operate_get_##m_right(&p_right));                                 \
			r_valid = true;                                                                                                  \
		}                                                                                                                    \
                                                                                                                             \
		static inline void validated_evaluate(const Variant *left, const Variant *right, Variant *r_ret) {                   \
			*VariantGetInternalPtr<bool>::get_ptr(r_ret) = m_op(_operate_get_##m_left(left), _operate_get_##m_right(right)); \
		}                                                                                                                    \
                                                                                                                             \
		static void ptr_evaluate(const void *left, const void *right, void *r_ret) {                                         \
			PtrToArg<bool>::encode(m_op(_operate_get_ptr_##m_left(left), _operate_get_ptr_##m_right(right)), r_ret);         \
		}                                                                                                                    \
                                                                                                                             \
		static Variant::Type get_return_type() {                                                                             \
			return Variant::BOOL;                                                                                            \
		}                                                                                                                    \
	};
OP_EVALUATOR(OperatorEvaluatorNilXBoolOr, nil, bool, _operate_or)
OP_EVALUATOR(OperatorEvaluatorBoolXNilOr, bool, nil, _operate_or)
OP_EVALUATOR(OperatorEvaluatorNilXIntOr, nil, int, _operate_or)
OP_EVALUATOR(OperatorEvaluatorIntXNilOr, int, nil, _operate_or)
OP_EVALUATOR(OperatorEvaluatorNilXFloatOr, nil, float, _operate_or)
OP_EVALUATOR(OperatorEvaluatorFloatXNilOr, float, nil, _operate_or)
OP_EVALUATOR(OperatorEvaluatorObjectXNilOr, object, nil, _operate_or)
OP_EVALUATOR(OperatorEvaluatorNilXObjectOr, nil, object, _operate_or)
OP_EVALUATOR(OperatorEvaluatorBoolXBoolOr, bool, bool, _operate_or)
OP_EVALUATOR(OperatorEvaluatorBoolXIntOr, bool, int, _operate_or)
OP_EVALUATOR(OperatorEvaluatorIntXBoolOr, int, bool, _operate_or)
OP_EVALUATOR(OperatorEvaluatorBoolXFloatOr, bool, float, _operate_or)
OP_EVALUATOR(OperatorEvaluatorFloatXBoolOr, float, bool, _operate_or)