Add WAS_RUNNING state constants to usage event repositories

WAS_RUNNING is a synthetic state used by an upcoming one-time data
migration to mark currently-running processes and existing service
instances as a baseline for billing consumers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: joyvuu-dave

app/repositories/app_usage_event_repository.rb

@@ -4,6 +4,8 @@
 module VCAP::CloudController
   module Repositories
     class AppUsageEventRepository
+      WAS_RUNNING_STATE = 'WAS_RUNNING'.freeze
+
       def find(guid)
         AppUsageEvent.find(guid:)
       end

app/repositories/service_usage_event_repository.rb

@@ -7,6 +7,7 @@ class ServiceUsageEventRepository
       DELETED_EVENT_STATE = 'DELETED'.freeze
       CREATED_EVENT_STATE = 'CREATED'.freeze
       UPDATED_EVENT_STATE = 'UPDATED'.freeze
+      WAS_RUNNING_EVENT_STATE = 'WAS_RUNNING'.freeze
 
       def find(guid)
         ServiceUsageEvent.find(guid:)