### 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.
"$..HostId",
            "$..VersionId",
            "$..HTTPHeaders.content-type",
            "$..HTTPHeaders.last-modified",
            "$..HTTPHeaders.location",
            "$..MaxAttemptsReached",
        ],
    )
    def test_put_and_get__with_content_language_disposition(
        self, s3_bucket, snapshot, aws_client
    ):
        snapshot.add_transformer(snapshot.transform.s3_api())
        snapshot.add_transformer(HEADER_TRANSFORMER)
        response = aws_client.s3.put_(
            Bucket=s3_bucket,
            Key="test",
            Body=b"abc123",
            ContentLanguage="de",
            ContentDisposition='attachment; filename="foo.jpg"',
            CacheControl="no-cache",
        )
        assert response["ResponseMetadata"]["HTTPStatusCode"] == 200
        snapshot.match("put-", response)
        snapshot.match("put--headers", response["ResponseMetadata"])
        response = aws_client.s3.get_(Bucket=s3_bucket, Key="test")
        snapshot.match("get-", response)
        snapshot.match("get--headers", response["ResponseMetadata"])
        assert response["Body"].read() == b"abc123"
    @pytest.mark.aws_validated
    def test_resource__with_slashes_in_key(self, s3_resource, s3_bucket, aws_client):