chore: Move Whatsapp template sync to cron (#4858)

syncing WhatsApp templates job is moved to a cron job for a better user experience. The Templates are synced at 15-minute intervals now.

spec/factories/channel/channel_whatsapp.rb

@@ -34,6 +34,15 @@ FactoryBot.define do
     end
     message_templates_last_updated { Time.now.utc }
 
+    transient do
+      sync_templates { true }
+    end
+
+    before(:create) do |channel_whatsapp, options|
+      # since factory already has the required message templates, we just need to bypass it getting updated
+      channel_whatsapp.define_singleton_method(:sync_templates) { return } unless options.sync_templates
+    end
+
     after(:create) do |channel_whatsapp|
       create(:inbox, channel: channel_whatsapp, account: channel_whatsapp.account)
     end