Revert "[mlir] Add `res()` method to `linalg::ContractionOpInterface` (#76539)"

This reverts commit 53edf12e.

Reason: Broke the sanitizer buildbots with a memory leak. More
information available on
https://github.com/llvm/llvm-project/commit/53edf12e526704cc251b6a6917319c7cb7a653a0