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Fixes #1359 The composite checksums in **CompleteMultipartUpload** generally follow the format `checksum-<number_of_parts>`. Previously, the gateway treated composite checksums as regular checksums without distinguishing between the two formats. In S3, the `x-amz-checksum-*` headers accept both plain checksum values and the `checksum-<number_of_parts>` format. However, after a successful `CompleteMultipartUpload` request, the final checksum is always stored with the part number included. This implementation adds support for parsing both formats—checksums with and without the part number. From now on, composite checksums are consistently stored with the part number included. Additionally, two integration tests are added: * One verifies the final composite checksum with part numbers. * Another ensures invalid composite checksums are correctly rejected.