chore: Fix conversation status in webhooks (#3364)

- fix the wrong conversation status being sent in webhooks
- additional information in websocket events
- refactor activity messaging code
- move activity message generation to background job to stop the callback loop

app/models/concerns/assignment_handler.rb

@@ -43,35 +43,4 @@ module AssignmentHandler
       create_assignee_change_activity(user_name)
     end
   end
-
-  def generate_team_change_activity_key
-    key = team_id ? 'assigned' : 'removed'
-    key += '_with_assignee' if key == 'assigned' && saved_change_to_assignee_id? && assignee
-    key
-  end
-
-  def create_team_change_activity(user_name)
-    return unless user_name
-
-    key = generate_team_change_activity_key
-    params = { assignee_name: assignee&.name, team_name: team&.name, user_name: user_name }
-    if key == 'removed'
-      previous_team_id = previous_changes[:team_id][0]
-      params[:team_name] = Team.find_by(id: previous_team_id)&.name if previous_team_id.present?
-    end
-    content = I18n.t("conversations.activity.team.#{key}", **params)
-
-    messages.create(activity_message_params(content))
-  end
-
-  def create_assignee_change_activity(user_name)
-    return unless user_name
-
-    params = { assignee_name: assignee&.name, user_name: user_name }.compact
-    key = assignee_id ? 'assigned' : 'removed'
-    key = 'self_assigned' if self_assign? assignee_id
-    content = I18n.t("conversations.activity.assignee.#{key}", **params)
-
-    messages.create(activity_message_params(content))
-  end
 end