### 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)
        # actu
        response = .get(website_url)
        assert response.status_code == 200
        assert response.text == "index"
        aws_client.s3.put_(
            Bucket=bucket_name,
            Key="directory/index.html",
            Body="index",
            ContentType="text/html",
            ACL="public-read",
        )
        response = .get(f"{website_url}/directory", allow_redirects=False)
        assert response.status_code == 302
        assert response.headers["Location"] == "/directory/"
        response = .get(f"{website_url}/directory/", verify=False)
        assert response.status_code == 200
        assert response.text == "index"
        response = .get(f"{website_url}/directory-wrong", verify=False)
        assert response.status_code == 404
        snapshot.match("404-no-trailing-slash", response.text)
        response = .get(f"{website_url}/directory-wrong/", verify=False)
        assert response.status_code == 404
        snapshot.match("404-with-trailing-slash", 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_404(self, s3_create_bucket, snapshot, aws_client):