PLT-6155: Keep pin badges in RHS consistent with that in center (#6018)

Sync search store when recieving pin/unpin event to keep pin
badges in RHS consistent with that in center channel.

webapp/utils/async_client.jsx

@@ -1606,7 +1606,8 @@ export function pinPost(channelId, reaction) {
             // the "post_edited" websocket event take cares of updating the posts
             // the action below is mostly dispatched for the RHS to update
             AppDispatcher.handleServerAction({
-                type: ActionTypes.RECEIVED_POST_PINNED
+                type: ActionTypes.RECEIVED_POST_PINNED,
+                reaction
             });
         },
         (err) => {
@@ -1623,7 +1624,8 @@ export function unpinPost(channelId, reaction) {
             // the "post_edited" websocket event take cares of updating the posts
             // the action below is mostly dispatched for the RHS to update
             AppDispatcher.handleServerAction({
-                type: ActionTypes.RECEIVED_POST_UNPINNED
+                type: ActionTypes.RECEIVED_POST_UNPINNED,
+                reaction
             });
         },
         (err) => {