Add view_room to Action enum (#7203)

* Add ViewRoom action to Action enum

Signed-off-by: Renan <renancleyson.f@gmail.com>

* Change view_room occurrences to Action.ViewRoom

Signed-off-by: Renan <renancleyson.f@gmail.com>

* Add missing Action import

src/components/structures/GroupView.js

@@ -175,7 +175,7 @@ class FeaturedRoom extends React.Component {
         e.stopPropagation();
 
         dis.dispatch({
-            action: 'view_room',
+            action: Action.ViewRoom,
             room_alias: this.props.summaryInfo.profile.canonical_alias,
             room_id: this.props.summaryInfo.room_id,
         });