ui: Dispatch action to display alert message after email subscription

Alert notification has to be showed after user subscribed to
release notes.

Release note: None

pkg/ui/src/redux/customAnalytics/customAnalyticsSagas.ts

@@ -13,6 +13,8 @@ import Analytics from "analytics-node";
 
 import { PayloadAction } from "src/interfaces/action";
 import { COCKROACHLABS_ADDR } from "src/util/cockroachlabsAPI";
+import { emailSubscriptionAlertLocalSetting } from "src/redux/alerts";
+
 import {
   completeEmailSubscriptionSignUp,
   EMAIL_SUBSCRIPTION_SIGN_UP,
@@ -49,6 +51,7 @@ export function* signUpEmailSubscription(action: PayloadAction<EmailSubscription
     },
   });
   yield put(completeEmailSubscriptionSignUp());
+  yield put(emailSubscriptionAlertLocalSetting.set(true));
 }
 
 export function* customAnalyticsSaga() {