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

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

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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)

ee/spec/services/audit_event_service_spec.rb

@@ -94,7 +94,7 @@
         expect { service.security_event }.to change(AuditEvent, :count).by(1)
       end
 
-      context 'when sync_audit_events_to_new_tables is disabled does not create audit events' do
+      context 'when sync_audit_events_to_new_tables is disabled' do
         before do
           stub_feature_flags(sync_audit_events_to_new_tables: false)
         end
@@ -125,7 +125,7 @@
         end
       end
 
-      context 'when sync_audit_events_to_new_tables is enabled it creates audit events' do
+      context 'when sync_audit_events_to_new_tables is enabled' do
         before do
           stub_feature_flags(sync_audit_events_to_new_tables: true)
         end