### 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.
Params={
                "Bucket": bucket_name,
                "Key": _key,
                "ContentType": "application/pdf",
                "ACL": "bucket-owner-full-control",
            },
            ExpiresIn=3600,
        )
        # mimi
        result = .options(
            url,
            headers={
                "Origin": "https://localhost:4200",
                "Access-Control-Request-Method": "PUT",
            },
        )
        snapshot.match("raw-response-headers-2", dict(result.headers))
        result = .put(
            url,
            data="something",
            verify=False,
            headers={
                "Origin": "https://localhost:4200",
                "Content-Type": "application/pdf",
            },
        )
        assert result.status_code == 200
        snapshot.match("raw-response-headers-3", dict(result.headers))
        result = .put(
            url,