### 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.
member_name = member_shape.serialization.get("name", key)
            # We need to special case member shapes that are marked as an xmlAttribute.
            # Rather than serializing into an XML child node, we instead serialize the shape to
            # an XML attribute of the *current* node.
            if member_shape.serialization.get("xmlAttribute"):
                # xmlAttributes must have a serialization name.
                xml_attribute_name = member_shape.serialization["name"]
                structure_node.attrib[xml_attribute_name] = value
                continue
            self._serialize(member_shape, value, structure_node, member_name)
    def _serialize_type_list(
        self, xmlnode: ETree.Element, params: list, shape: ListShape, name: str
    ) -> None:
        if params is None:
            # Don't serialize any param whose value is None.
            return
        member_shape = shape.member
        if shape.serialization.get("flattened"):
            # If the list is flattened, eith
            # element for the children.
            element_name = self._get_serialized_name(member_shape, name)
            list_node = xmlnode
        else:
            element_name = self._get_serialized_name(member_shape, "member")
            list_node = ETree.SubElement(xmlnode, name)
        for item in params:
            # Don't serialize any item which is None
            if item is not None:
                self._serialize(member_shape, item, list_node, element_name)
    def _serialize_type_map(