chore: Generate webhook-verify-token automatically (#5593)

- Autogenerate webhook verification token in the WhatsAppCloud channel.

Co-authored-by: Sojan <sojan@pepalo.com>

lib/regex_helper.rb

@@ -7,7 +7,7 @@ module RegexHelper
   UNICODE_CHARACTER_NUMBER_HYPHEN_UNDERSCORE = Regexp.new('\A[\p{L}\p{N}]+[\p{L}\p{N}_-]+\Z')
   MENTION_REGEX = Regexp.new('\[(@[\w_. ]+)\]\(mention://(?:user|team)/\d+/(.*?)+\)')
 
-  TWILIO_CHANNEL_SMS_REGEX = Regexp.new('^\+\d{1,14}\z')
-  TWILIO_CHANNEL_WHATSAPP_REGEX = Regexp.new('^whatsapp:\+\d{1,14}\z')
+  TWILIO_CHANNEL_SMS_REGEX = Regexp.new('^\+\d{1,15}\z')
+  TWILIO_CHANNEL_WHATSAPP_REGEX = Regexp.new('^whatsapp:\+\d{1,15}\z')
   WHATSAPP_CHANNEL_REGEX = Regexp.new('^\d{1,14}\z')
 end