### 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.
key_name = "test-sse-validate-kms-key-no-check"
            response = aws_client.s3.put_(
                Bucket=bucket_name,
                Key=key_name,
                Body=data,
                ServerSideEncryption="aws:kms",
                SSEKMSKeyId="fake-key-id",
            )
            assert response["ResponseMetadata"]["HTTPStatusCode"] == 200
            response = aws_client.s3.create_multipart_upload(
                Bucket=bucket_name,
                Key="multipart-test-sse-validate-kms-key-no-check",
                ServerSideEncryption="aws:kms",
                SSEKMSKeyId="fake-key-id",
            )
            assert response["ResponseMetadata"]["HTTPStatusCode"] == 200
            response = aws_client.s3.copy_(
                Bucket=bucket_name,
                Key="copy-test-sse-validate-kms-key-no-check",
                CopySource={"Bucket": bucket_name, "Key": key_name},
                ServerSideEncryption="aws:kms",
                SSEKMSKeyId="fake-key-id",
            )
            assert response["ResponseMetadata"]["HTTPStatusCode"] == 200
        key_name = "test-sse-validate-kms-key"
        fake_key_uuid = "134f2428-cec1-4b25-a1ae-9048164dba47"
        # acti
        monkeypatch.setattr(config, "S3_SKIP_KMS_KEY_VALIDATION", False)
        with 
            aws_client.s3.put_(