Add --total-gpus to multi-model model-cohost deployment config.

PiperOrigin-RevId: 863070590

Author: vertex-mg-bot

notebooks/community/model_garden/model_garden_model_cohost.ipynb

@@ -6273,6 +6273,7 @@
         "        f\"--model-replicas={model_replicas}\",\n",
         "        \"--data-parallel-size=1\",\n",
         "        \"--swap-space=16\",\n",
+        "        f\"--total-gpus={accelerator_count}\",\n",
         "    ]\n",
         "\n",
         "    if multihost_gpu_node_count > 1:\n",