Remove reservation colab (#5168)

- We no longer need this colab, as the UI now
supports all reservation operations and is much easier.

Fixes: #3588

dev_tools/notebooks/isolated_notebook_test.py

@@ -47,7 +47,6 @@
     'docs/tutorials/google/identifying_hardware_changes.ipynb',
     'docs/tutorials/google/echoes.ipynb',
     'docs/tutorials/google/floquet_calibration_example.ipynb',
-    'docs/tutorials/google/reservations.ipynb',
     'docs/tutorials/google/spin_echoes.ipynb',
     'docs/tutorials/google/start.ipynb',
     'docs/tutorials/google/visualizing_calibration_metrics.ipynb',

docs/google/concepts.ipynb

@@ -294,9 +294,7 @@
     "\n",
     "The schedule of a processor is \"frozen\" for 4 hours into the immediate future so that users can rely on it for the coming day.\n",
     "\n",
-    "The ability to make reservations is restricted by budgets that are delegated by Quantum Computing Service admins. These are provided on a weekly basis and communicated either during the weekly user sync or by email and are good for one week in the future, but this policy is subject to change.\n",
-    "\n",
-    "You can use this [reservation colab utility](../tutorials/google/reservations.ipynb)  to view the processor schedule and make reservations."
+    "The ability to make reservations is restricted by budgets that are delegated by Quantum Computing Service admins. These are provided on a weekly basis and communicated either during the weekly user sync or by email and are good for one week in the future, but this policy is subject to change.\n"
    ]
   }
  ],