### 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.
},
        )
        website_url = _website_bucket_url(bucket_name)
        # test
        response = .get(f"{website_url}/docs/test.html")
        assert response.status_code == 200
        assert response.text == "test"
        response = .get(f"{website_url}/another/path/test.html")
        assert response.status_code == 200
        assert response.text == "test"
        response = .get(f"{website_url}/docs/mydocs/test.html")
        assert response.status_code == 200
        assert response.text == "mydocs"
        # no r
        response = .get(f"{website_url}/docs2/test.html")
        assert response.status_code == 404
        assert response.text == "error"
    @pytest.mark.aws_validated
    @pytest.mark.skipif(
        condition=LEGACY_S3_PROVIDER,
        reason="Legacy S3 provider does not provide website routing rules",
    )
    def test_routing_rules_order(self, s3_create_bucket, aws_client):
        bucket_name = f"bucket-{short_uid()}"
        s3_create_bucket(Bucket=bucket_name, ACL="public-read")
        aws_client.s3.put_bucket_website(
            Bucket=bucket_name,
            WebsiteConfiguration={
                "IndexDocument": {"Suffix": "index.html"},
                "ErrorDocument": {"Key": "error.html"},