### 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())
        _key = "source-"
        bucket_name = s3_create_bucket()
        resp = aws_client.s3.put_(
            Bucket=bucket_name,
            Key=_key,
            Body='{"key": "value"}',
            ContentType="application/json",
            Metadata={"key": "value"},
        )
        snapshot.match("put_", resp)
        head_ = aws_client.s3.head_(Bucket=bucket_name, Key=_key)
        snapshot.match("head_", head_)
        _key_copy = f"{_key}-copy"
        resp = aws_client.s3.copy_(
            Bucket=bucket_name,
            CopySource=f"{bucket_name}/{_key}",
            Key=_key_copy,
            Metadata={"another-key": "value"},
            ContentType="application/javascript",
            MetadataDirective="REPLACE",
        )
        snapshot.match("copy_", resp)
        head_ = aws_client.s3.head_(Bucket=bucket_name, Key=_key_copy)
        snapshot.match("head__copy", head_)
    @pytest.mark.aws_validated
    @pytest.mark.skip_snapshot_verify(paths=["$..ServerSideEncryption"])
    def test_s3_copy_metadata_directive_copy(self, s3_create_bucket, snapshot, aws_client):