Make response explicit in Thrift Policy Enforcer

Summary:
As discussed in the [prev diff](https://www.internalfb.com/diff/D87361059?dst_version_fbid=905143925172710&transaction_fbid=2102626750543907), we want `$response` explicit for durable integration

This diff:
- pass `$response` as an argument of `genProcessResponse`
- make privacylib take `$response` directly
- legacy probes integration is intact and pending for privacylib migration

Differential Revision: D88085026

fbshipit-source-id: bab0848a0a33c46a4daf213f0b1c78e5e63324f0

Author: xueyurf

third-party/thrift/src/thrift/lib/hack/src/ThriftServiceMethodNameVirtualPolicyEnforcer.php

@@ -184,6 +184,7 @@ private static function customLogging(
     string $policy_enforcer_api,
     PolicyEnforcerCallerIdentity $caller,
     PolicyEnforcerContext $context,
+    mixed $response,
   ): Awaitable<void> {
     // Pending Probes PrivacyLib post-read Integration
     await self::genExecuteStandaloneProbes(