Add customer_facing_name_change to activity log event type enum (#498)

New event type introduced in intercom/intercom#506120 to audit changes
to the workspace customer-facing name field.

Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: baraarahhal

descriptions/2.14/api.intercom.io.yaml

@@ -14481,6 +14481,7 @@ components:
           - conversation_topic_creation
           - conversation_topic_deletion
           - custom_authentication_token_creation
+          - customer_facing_name_change
           - help_center_settings_change
           - inbound_conversations_change
           - inbox_access_change