[Gekidou MM-3972] Websocket Events - Reaction and emojis (#5920)

* Wip

* update name so it references changing the reaction on a post

* handleAddEmoji -> handleAddCustomEmoji

* add remove reaction logic

* sanitizeReactions
  * use skipSync to return early if not deleting any records that are
    not in the server db
  * return the filtered delete results and have the handler destroy the
    records

* fix lint

* use forEach instead of map.

* PR feedback

* PR feedback

* Update app/actions/websocket/reactions.ts

* remove console.log

Co-authored-by: Elias Nahum <nahumhbl@gmail.com>

types/database/database.d.ts

@@ -92,6 +92,7 @@ export type SanitizeReactionsArgs = {
   database: Database;
   post_id: string;
   rawReactions: Reaction[];
+  skipSync?: boolean;
 };
 
 export type ChainPostsArgs = {