Temporary disable cat tests on MacOS due to Sandcastle failure
Summary: The `cat` op tests pass on device and local MacOS, but will fail during Sandcastle runs. Disabling them for now while we investigate why they fail in Sandcastle.
Test Plan: `buck test //fbobjc/Apps/Internal/PyTorchPlaygroundMac:PyTorchPlaygroundMacTests`
Reviewed By: xta0
Differential Revision: D26468606
fbshipit-source-id: 440369bb68641060fa98dbf37fb8825ee56083e0
