ref(api): move feedbackSubmitted notification to api middleware

react/features/external-api/middleware.js

 import { NOTIFY_CAMERA_ERROR, NOTIFY_MIC_ERROR } from '../base/devices';
 import { JitsiConferenceErrors } from '../base/lib-jitsi-meet';
 import { MiddlewareRegistry } from '../base/redux';
+import { SUBMIT_FEEDBACK } from '../feedback';
 
 declare var APP: Object;
 
             APP.API.notifyOnMicError(action.error.name, action.error.message);
         }
         break;
+
+    case SUBMIT_FEEDBACK:
+        APP.API.notifyFeedbackSubmitted();
+        break;
     }
 
     return next(action);

react/features/feedback/index.js

 export * from './actionTypes';
 export * from './components';
 
-import './middleware';
 import './reducer';

react/features/feedback/middleware.js

-/* @flow */
-
-import { MiddlewareRegistry } from '../base/redux';
-
-import { SUBMIT_FEEDBACK } from './actionTypes';
-
-declare var APP: Object;
-
-/**
- * Implements the middleware of the feature feedback.
- *
- * @param {Store} store - The redux store.
- * @returns {Function}
- */
-// eslint-disable-next-line no-unused-vars
-MiddlewareRegistry.register(store => next => action => {
-    switch (action.type) {
-    case SUBMIT_FEEDBACK:
-        if (typeof APP === 'object') {
-            APP.API.notifyFeedbackSubmitted();
-        }
-        break;
-    }
-
-    return next(action);
-});