### 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.
response = super()._prepare_additiin_response(response, operation_model)
        response.headers["x-amz-request-id"] = gen_amzn_requestid_long()
        return response
    def _process_header_members(self, parameters: dict, response: HttpResponse, shape: Shape):
        shape_members = shape.members if isinstance(shape, StructureShape) else []
        for name in shape_members:
            member_shape = shape_members[name]
            ")
            if not location:
                continue
            if name not in parameters:
                # ignores optional keys
                continue
            key = member_shape.serialization.get("name", name)
            value = parameters[name]
            ue is None:
                continue
             == "header":
                response.headers[key] = self._serialize_header_value(member_shape, value)
            el == "headers":
                header_prefix = key
                self._serialize_header_map(header_prefix, response, value)
            el == "statusCode":
                response.status_code = int(value)
    def _serialize_header_map(self, prefix: str, response: HttpResponse, params: dict) -> None:
        """Serializes the header map for the location trait "headers"."""
        for key, val in params.items():
            actual_key = prefix + key
            response.headers[actual_key] = val
    def _serialize_header_value(self, shape: Shape, value: Any):