[ReleasePR streamanalytics] set readonly property of contentStorageAccount to false (#1344)

Create to sync Azure/azure-rest-api-specs#11630

Author: msftbot[bot]

schemas/2016-03-01/Microsoft.StreamAnalytics.json

@@ -2091,4 +2091,4 @@
       "description": "The properties that are associated with a transformation."
     }
   }
-}
+}

schemas/2017-04-01-preview/Microsoft.StreamAnalytics.json

@@ -3001,4 +3001,4 @@
       "description": "The properties that are associated with a transformation."
     }
   }
-}
+}

schemas/2020-03-01-preview/Microsoft.StreamAnalytics.json

@@ -300,4 +300,4 @@
       "description": "Bag of properties defining a privatelinkServiceConnection."
     }
   }
-}
+}