feat: Add conversation deletion schedule TAL event types to OpenAPI enum (#378)

Registers 4 new event types for the activity log API endpoint.
Companion to intercom/intercom#473796.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: thibault-intercom

descriptions/2.15/api.intercom.io.yaml

@@ -14739,6 +14739,10 @@ components:
           - bulk_export
           - campaign_deletion
           - campaign_state_change
+          - conversation_deletion_schedule_creation
+          - conversation_deletion_schedule_deletion
+          - conversation_deletion_schedule_state_change
+          - conversation_deletion_schedule_update
           - conversation_part_deletion
           - conversation_topic_change
           - conversation_topic_creation