### 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_transformer(snapshot.transform.s3_api())
        bucket_name = f"bucket-does-not-exist-{short_uid()}"
        with 
            response = aws_client.s3.list_s(Bucket=bucket_name)
        e.match("NoSuchBucket")
        snapshot.match("list_", e.value.response)
        with 
            response = s3_vhost_client.list_s(Bucket=bucket_name)
        e.match("NoSuchBucket")
        snapshot.match("list__vhost", e.value.response)
        bucket_vhost_url = _bucket_url_vhost(bucket_name, region="us-east-1")
        assert "us-east-1" not in bucket_vhost_url
        response = .get(bucket_vhost_url)
        assert response.status_code == 404
        bucket_url = _bucket_url(bucket_name, region="us-east-1")
        assert "us-east-1" not in bucket_url
        response = .get(bucket_url)
        assert response.status_code == 404
        bucket_vhost_url = _bucket_url_vhost(bucket_name, region="us-west-2")
        assert "us-west-2" in bucket_vhost_url
        response = .get(bucket_vhost_url)
        assert response.status_code == 404
        bucket_url = _bucket_url(bucket_name, region="us-west-2")
        assert "us-west-2" in bucket_url
        response = .get(bucket_url)
        assert response.status_code == 404
    @pytest.mark.aws_validated
    @pytest.mark.skip_snapshot_verify(
        condition=lambda: not LEGACY_S3_PROVIDER,
        paths=["$..x-amz-access-point-alias", "$..x-amz-id-2"],