### 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.
Key="index.html",
            Body="index",
            ContentType="text/html",
            ACL="public-read",
        )
        redirected_bucket_website = _website_bucket_url(bucket_name_redirected)
        response_no_redirect = .get(redirected_bucket_website, allow_redirects=False)
        assert response_no_redirect.status_code == 301
        assert response_no_redirect.content == b""
        response_redirected = .get(redirected_bucket_website)
        assert response_redirected.status_code == 200
        assert response_redirected.content == b"index"
        response = .get(bucket_website_url)
        assert response.status_code == 200
        assert response.content == b"index"
        assert response.content == response_redirected.content
        response_redirected = .get(f"{redirected_bucket_website}/random-key")
        assert response_redirected.status_code == 404
    @staticmethod
    def _get_static_hosting_transformers(snapshot):
        return [
            snapshot.transform.regex(
                "RequestId: (.*?)</li>", replacement="RequestId: <request-id></li>"
            ),
            snapshot.transform.regex("HostId: (.*?)</li>", replacement="HostId: <host-id></li>"),
            snapshot.transform.regex(
                "BucketName: (.*?)</li>", replacement="BucketName: <bucket-name></li>"
            ),
        ]
class TestS3Routing: