### 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.
snapshot.add_transformers_list(self._get_static_hosting_transformers(snapshot))
        bucket_name = f"bucket-{short_uid()}"
        s3_create_bucket(Bucket=bucket_name, ACL="public-read")
        random_url = _website_bucket_url(f"non-existent-bucket-{short_uid()}")
        response = .get(random_url, verify=False)
        assert response.status_code == 404
        snapshot.match("no-such-bucket", response.text)
        website_url = _website_bucket_url(bucket_name)
        # actu
        response = .get(website_url, verify=False)
        assert response.status_code == 404
        snapshot.match("no-such-website-config", response.text)
        url = f"{website_url}/actual/key.html"
        response = .get(url)
        assert response.status_code == 404
        snapshot.match("no-such-website-config-key", response.text)
    @pytest.mark.aws_validated
    @pytest.mark.skipif(
        condition=LEGACY_S3_PROVIDER and not is_aws_cloud(),
        reason="Legacy S3 provider does not provide proper website support",
    )
    def test_website_hosting_http_methods(self, s3_create_bucket, snapshot, aws_client):