Removes azure-resource-manager-schemas from SDK automation. It can be…

… re-added without reverting this commit. (#30893)

This change produces an extra warning but no obvious new errors.

specificationRepositoryConfiguration.json

@@ -29,10 +29,6 @@
       "integrationRepository": "azure-sdk/azure-sdk-for-python",
       "mainRepository": "Azure/azure-sdk-for-python"
     },
-    "azure-resource-manager-schemas": {
-      "integrationRepository": "azure-sdk/azure-resource-manager-schemas",
-      "mainRepository": "Azure/azure-resource-manager-schemas"
-    },
     "azure-powershell": {
       "integrationRepository": "azure-sdk/azure-powershell",
       "mainRepository": "Azure/azure-powershell"