### 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.
When implementing services with this serializer, some edge cases might not work out-of-the-box.
    """
    TIMESTAMP_FORMAT = "unixmp"
    def _serialize_error(
        self,
        error: ServiceException,
        response: HttpResponse,
        shape: StructureShape,
        operation_model: OperationModel,
    ) -> None:
        # TODO implement different service-specific serializer configurations
        #   - currently we set both, the `__type` member as well as the `X-Amzn-Errortype` header
        #   - the specification defines that it's either the __type field OR the header
        #     (https://awslabs.github.io/smithy/1.0/spec/aws/aws-json-1_1-protocol.html#operation-error-serialization)
        body = {"__type": error.code}
        response.headers["X-Amzn-Errortype"] = error.code
        message = self._get_error_message(error)
        if message is not None:
            body["message"] = message
        if shape:
            remaining_params = {}
            for member in shape.members:
                if hasattr(error, member):
                    remaining_params[member] = getattr(error, member)
                elif member.lower() in ["code", "message", "type"] and hasattr(
                    error, member.lower()
                ):
                     in the specs
                    remaining_params[member] = getattr(error, member.lower())
            self._serialize(body, remaining_params, shape)