### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

In AWS, DescribeSubnet Response returns:
```
<?xml version="1.0" encoding="UTF-8"?>\n
    <Response>
        <Errors>
            <Error>
                <Code>InvalidSubnetID.NotFound</Code>
                <Message>The subnet ID \'test\' does not exist</Message>
            </Error>
        </Errors>
    <RequestID>f6d041c1-1c96-4720-af30-77745504e2ba</RequestID>
</Response>
```

whereas localstack returns:
```
<?xml version=\'1.0\' encoding=\'utf-8\'?>\n<Errors xmlns="http://ec2.amazonaws.com/doc/2016-11-15">
    <Error>
        <Code>InvalidSubnetID.NotFound</Code>
        <Message>aaThe subnet ID \'vpc-test\' does not exist</Message>
    </Error>
    <RequestID>EADJHWMM796CI5FT10XGFMGOXIPCBAHBWINMV0HR6SKBRODGCU5J</RequestID>
</Errors>

```

### Expected Behavior

It should return correct response structure. It causes terraform to complain.

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    make start

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

     awslocal ec2 describe-subnets --subnet-ids vpc-test --debug


### Environment

```markdown
- OS: M1 MacOS
- LocalStack: 1.0.2.dev
```


### Anything else?

Probably `call_moto` function in `localstack/services/moto.py` is changing the error code structure.
parameters = {
        "UserPool": {
            "LastModifiedDate": datetime(2022, 2, 8, 9, 17, 40, 122939, tzinfo=tzlocal()),
        }
    }
    _botocore_serializer_integration_test("cognito-idp", "DescribeUserPool", parameters)
def test_restjson_protocol_error_serialization():
    class ThrottledException(ServiceException):
        code: str = "ThrottledException"
        sender_fault: bool = False
        status_code: int = 429
    exception = ThrottledException("Exception message!")
    response = _botocore_error_serializer_integration_test(
        "xray",
        "UpdateSamplingRule",
        exception,
        "ThrottledException",
        429,
        "Exception message!",
    )
    
    
    assert (
        response.get("ResponseMetadata", {}).get("HTTPHeaders", {}).get("x-amzn-errortype")
        == "ThrottledException"
    )
def test_restjson_protocol_custom_error_serialization():