feat: Add delivery reports for API channel (#8116)

spec/controllers/public/api/v1/inbox/conversations_controller_spec.rb

@@ -81,6 +81,7 @@ RSpec.describe 'Public Inbox Contact Conversations API', type: :request do
 
     it 'updates the last seen of the conversation contact' do
       contact_last_seen_at = conversation.contact_last_seen_at
+      expect(Conversations::MarkMessagesAsReadJob).to receive(:perform_later).with(conversation)
       post update_last_seen_path
 
       expect(response).to have_http_status(:success)