Sync audit events to new tables

What does this MR do and why?

Sync audit events to new tables

This commit enables syncing of audit events to new tables using AuditEventService

EE: true

MR acceptance checklist

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Before	After

How to set up and validate locally

1. Login to local gdk
2. Check AuditEvent.last and AuditEvents::UserAuditEvent.last are both generated.

Related to #470481 (closed)

app/services/audit_event_service.rb

@@ -2,6 +2,7 @@
 
 class AuditEventService
   include AuditEventSaveType
+  include ::Gitlab::Audit::Logging
 
   # Instantiates a new service
   #
@@ -123,6 +124,7 @@ def log_security_event_to_database
 
     event = build_event
     save_or_track event
+    log_to_new_tables([event], event.class.to_s) if should_save_database?(@save_type)
     event
   end