### 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.
"""
    Test to cover StaticWebsiteHosting functionality.
    """
    @pytest.mark.aws_validated
    def test_s3_static_website_index(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=bucket_name,
            Key="index.html",
            Body="index",
            ContentType="text/html",
            ACL="public-read",
        )
        aws_client.s3.put_bucket_website(
            Bucket=bucket_name,
            WebsiteConfiguration={
                "IndexDocument": {"Suffix": "index.html"},
            },
        )
        url = _website_bucket_url(bucket_name)
        response = .get(url, verify=False)
        assert response.status_code == 200
        assert response.text == "index"
    @pytest.mark.aws_validated
    def test_s3_static_website_hosting(self, s3_create_bucket, aws_client):