Fix Slack report for Nightly CI and Past CI (#22901)

fix

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

utils/notification_service.py

@@ -958,7 +958,7 @@ if __name__ == "__main__":
         "Torch CUDA extension tests": "run_tests_torch_cuda_extensions_gpu_test_reports",
     }
 
-    if ci_event == "push":
+    if ci_event in ["push", "Nightly CI"] or ci_event.startswith("Past CI"):
         del additional_files["Examples directory"]
         del additional_files["PyTorch pipelines"]
         del additional_files["TensorFlow pipelines"]