Add missing conversation id for first response event (#2922)

- Add missing conversation id for first response event
- Fixing the flaky test

Fixes #2746

Co-authored-by: Tejaswini <tejaswini@chatwoot.com>

app/listeners/event_listener.rb

@@ -24,7 +24,8 @@ class EventListener < BaseListener
       value: first_response_time,
       account_id: conversation.account_id,
       inbox_id: conversation.inbox_id,
-      user_id: conversation.assignee_id
+      user_id: conversation.assignee_id,
+      conversation_id: conversation.id
     )
     event.save
   end