PLT-6443 Migrate add_oauth_app.jsx to be pure and use Redux (#7232)

* Migrate add_oauth_app.jsx to be pure and use Redux, add tests

* Remove unused flux code for OAuthApps

webapp/actions/oauth_actions.jsx

@@ -7,16 +7,6 @@ const getState = store.getState;
 
 import * as IntegrationActions from 'mattermost-redux/actions/integrations';
 
-export function listOAuthApps(complete) {
-    IntegrationActions.getOAuthApps(0, 10000)(dispatch, getState).then(
-        (data) => {
-            if (complete) {
-                complete(data);
-            }
-        }
-    );
-}
-
 export function deleteOAuthApp(id, success, error) {
     IntegrationActions.deleteOAuthApp(id)(dispatch, getState).then(
         (data) => {
@@ -29,16 +19,3 @@ export function deleteOAuthApp(id, success, error) {
         }
     );
 }
-
-export function registerOAuthApp(app, success, error) {
-    IntegrationActions.addOAuthApp(app)(dispatch, getState).then(
-        (data) => {
-            if (data && success) {
-                success(data);
-            } else if (data == null && error) {
-                const serverError = getState().requests.integrations.addOAuthApp.error;
-                error({id: serverError.server_error_id, ...serverError});
-            }
-        }
-    );
-}