[Gekidou[ [MM-43969, MM-44037] global threads crash, mark as read (#6253)

* Preparing thread data as well with prepareDeletePost

* observing the post directly to prevent the crash until the data issue is found

* mark as read, delete threeds fix

* Update thread.ts

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

types/database/models/servers/thread.d.ts

@@ -41,6 +41,9 @@ export default class ThreadModel extends Model {
     /** participants: All the participants of the thread */
     participants: Query<ThreadParticipantsModel>;
 
+    /** threadsInTeam : All the threadsInTeam associated with this Thread */
+    threadsInTeam: Query<ThreadInTeamModel>;
+
     /** post : Query returning the post data for the current thread */
     post: Relation<PostModel>;
 }