### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

The Complete Multipart Upload operation generates the **InternalError** error for non-existing uploads.

### Expected Behavior

The Complete Multipart Upload operation generates the **NoSuchUpload** error for non-existing uploads.

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

    docker run -it --rm -p 4566:4566 localstack/localstack

    aws s3api create-bucket --bucket test --endpoint-url http://localhost:4566 --create-bucket-configuration LocationConstraint=us-west-2

    aws s3api complete-multipart-upload --bucket test --endpoint-url http://localhost:4566 --key test --upload-id test

### Environment

```markdown
- OS: Windows 11
- LocalStack: latest
```


### Anything else?

The Abort Multipart Upload operation works correctly in LocalStack.

The official documentation: https://docs.aws.amazon.com/AmazonS3/latest/API/API_CompleteMultipartUpload.html
Amazon S3 throws the correct **NoSuchUpload** error for both Abort and Complete operations.
for encoding in None, "gzip":
            # put 
            _key = "key-by-hostname"
            aws_client.s3.put_(
                Bucket=s3_bucket,
                Key=_key,
                Body="something",
                ContentType="text/html; charset=utf-8",
            )
            url = aws_client.s3.generate_presigned_url(
                "delete_", Params={"Bucket": s3_bucket, "Key": _key}
            )
            # get 
            headers = {}
            if encoding:
                headers["Accept-Encoding"] = encoding
            response = .delete(url, headers=headers, verify=False)
            assert not response.content
            assert response.status_code == 204
            # AWS 
            assert response.headers.get("content-length") in [
                "0",
                None,
            ], f"Unexpected content-length in headers {response.headers}"
    @pytest.mark.aws_validated
    def test_head_has_correct_content_length_header(self, s3_bucket, aws_client):