### 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.
assert "content-type" in response.headers
        assert "text/html" == response.headers["content-type"]
        assert "etag" in response.headers
        assert actual_key_obj["ETag"] in response.headers["etag"]
        # If-N
        response = .get(
            url, headers={"If-None-Match": actual_key_obj["ETag"]}, verify=False
        )
        assert 304 == response.status_code
        # key 
        url = f"{website_url}/with-content-type/key.js"
        response = .get(url, verify=False)
        assert 200 == response.status_code
        assert "some js" == response.text
        assert "content-type" in response.headers
        assert "application/javascript; charset=utf-8" == response.headers["content-type"]
        assert "etag" in response.headers
        assert with_content_type_obj["ETag"] == response.headers["etag"]
        # inde
        url = f"{website_url}/test"
        response = .get(url, verify=False)
        assert 200 == response.status_code
        assert "index" == response.text
        assert "content-type" in response.headers
        assert "text/html" in response.headers["content-type"]
        assert "etag" in response.headers
        assert index_obj["ETag"] == response.headers["etag"]
        # root 
        url = f"{website_url}/"
        response = .get(url, verify=False)