### 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.
self, response: dict, operation_model: OperationModel
    ) -> HttpResponse:
        """
        Takes a response dict and serializes it to an actual HttpResponse.
        :param response: to serialize
        :param operation_model: specification of the service & operation containing information about the shape of the
                                service's output / response
        :return: HttpResponse which can be sent to the calling client
        :raises: ResponseSerializerError (either a ProtocolSerializerError or an UnknownSerializerError)
        """
        # if the operation has a streaming output, handle the serialization differently
        if operation_model.has_event_stream_output:
            return self._serialize_event_stream(response, operation_model)
        semodel)
        shape = operation_model.output_shape
        # The shape can also be none (for empty responses), but it still needs to be serialized (to add some metadata)
        shape_members = shape.members if shape is not None else None
        self._serialize_response(
            response, serialized_response, shape, shape_members, operation_model
        )
        serialized_response = self._prepare_additiin_response(
            serialized_response, operation_model
        )
        return serialized_response
    @_handle_exceptions
    def serialize_error_to_response(