[ReleasePR cosmos-db] [CosmosDB] Fixing bug in CassandraView APIs (#1917)

Create to sync Azure/azure-rest-api-specs#16052
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/cosmos-db?expand=1)

Author: msftbot[bot]

schemas/2021-07-01-preview/Microsoft.DocumentDB.json

@@ -2777,7 +2777,8 @@
         }
       },
       "required": [
-        "id"
+        "id",
+        "viewDefinition"
       ],
       "description": "Cosmos DB Cassandra view resource object"
     },