chore: Logger for non-existent WhatsApp channels (#11064)

- Add a warning logger for cases where we are getting webhook events for
inactive numbers.
- Add config to discard events for inactive numbers so that the meta
will stop sending events

---------

Co-authored-by: Pranav <pranav@chatwoot.com>

config/installation_config.yml

@@ -204,6 +204,11 @@
   display_title: 'Blocked Email Domains'
   description: 'Add a domain per line to block them from signing up, accepts Regex'
   type: code
+- name: INACTIVE_WHATSAPP_NUMBERS
+  value: ''
+  display_title: 'Inactive WhatsApp Numbers'
+  description: 'Comma-separated list of WhatsApp numbers that should be rejected with a 422 error'
+  type: code
 # ------- End of Chatwoot Internal Config for Cloud ----#
 
 # ------- Chatwoot Internal Config for Self Hosted ----#