### 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.
deapShape, key: str):
        ue is None:
            return
        map_obj = {}
        body[key] = map_obj
        for sub_key, sub_value in value.items():
            if sub_value is not None:
                self._serialize(map_obj, sub_value, shape.value, sub_key)
    def _serialize_type_list(self, body: dict, value: list, shape: ListShape, key: str):
        ue is None:
            return
        list_obj = []
        body[key] = list_obj
        for list_item in value:
            if list_item is not None:
                wrapper = {}
                # The JSON list serialization is the only case where we aren't
                # setting a key on a dict.  We handle this by using
                # a __current__ key on a wrapper dict to serialize each
                # list item before appending it to the serialized list.
                self._serialize(wrapper, list_item, shape.member, "__current__")
                list_obj.append(wrapper["__current__"])
    def _default_serialize(self, body: dict, value: Any, _, key: str):
        body[key] = value
    def _serialize_type_mp(self, body: dict, value: Any, shape: Shape, key: str):
        body[key] = self._convert_mp_to_str(
            value, shape.serialization.get("mpFormat")
        )
    def _serialize_type_blob(self, body: dict, value: Union[str, bytes], _, key: str):
        body[key] = self._get_base64(value)