Call torchrec cpu tests from fbgemm test gha (#4424)

Summary:

This diff kicks off the torchrec cpu unittests along with fbgemm's cpu tests when there is a pull request on fbgemm

Differential Revision: D77598015

Author: nipung90

.github/workflows/fbgemm_gpu_ci_cpu.yml

@@ -149,6 +149,9 @@ jobs:
         build-target: [ "default" ]
         python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
         compiler: [ "gcc", "clang" ]
+    permissions:
+        id-token: write
+        contents: read
     needs: build_artifact
 
     steps:
@@ -195,8 +198,20 @@ jobs:
       timeout-minutes: ${{ matrix.host-machine.timeout }}
       run: . $PRELUDE; test_all_fbgemm_gpu_modules $BUILD_ENV
 
+    - name: Test with Torchrec CPU tests
+      uses: pytorch/torchrec/.github/workflows/reusable_unittest_ci_cpu.yml@nipun/make_cpp_tests_reusable
+
     - name: Push Wheel to PyPI
       if: ${{ (github.event_name == 'schedule' || (github.event_name == 'workflow_dispatch' && github.event.inputs.publish_to_pypi == 'true')) && matrix.compiler == 'gcc' }}
       env:
         PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
       run: . $PRELUDE; publish_to_pypi $BUILD_ENV "$PYPI_TOKEN" *.whl
+
+
+  # Run torchrec CPU tests
+  # torchrec_cpu_tests:
+  #   needs: test_and_publish_artifact
+  #   permissions:
+  #     id-token: write
+  #     contents: read
+  #   uses: pytorch/torchrec/.github/workflows/reusable_unittest_ci_cpu.yml@nipun/make_cpp_tests_reusable