chore: Handle attachments in Whatsapp Channel (#3299)

send and receive attachments in 360Dialog WhatsApp channels

spec/factories/bot_message/bot_message_card.rb

@@ -4,7 +4,7 @@ FactoryBot.define do
   factory :bot_message_card, class: Hash do
     title { Faker::Book.name }
     description { Faker::Movie.quote }
-    media_url { 'https://via.placeholder.com/250x250.png' }
+    media_url { 'https://chatwoot-assets.local/sample.png' }
     actions do
       [{
         text: 'Select',

spec/factories/twitter/twitter_message_create_event.rb

@@ -22,12 +22,12 @@ FactoryBot.define do
         '1' => {
           id: '1',
           name: 'person 1',
-          profile_image_url: 'https://via.placeholder.com/250x250.png'
+          profile_image_url: 'https://chatwoot-assets.local/sample.png'
         },
         '2' => {
           id: '1',
           name: 'person 1',
-          profile_image_url: 'https://via.placeholder.com/250x250.png'
+          profile_image_url: 'https://chatwoot-assets.local/sample.png'
         }
       }
     end