quic: use QuicCallbackScope consistently for QuicSession

Author: jasnell

lib/internal/quic/core.js

@@ -2287,12 +2287,11 @@ class QuicServerSession extends QuicSession {
   async [kHandleOcsp](servername) {
     const internalState = this[kInternalState];
     const { context } = this[kInternalServerState];
-    const certificate = context?.context.getCertificate?.();
-    const issuer = context?.context.getIssuer?.();
-    return internalState.ocspHandler?.('request', {
+    if (!internalState.ocspHandler || !context) return undefined;
+    return internalState.ocspHandler('request', {
       servername,
-      certificate,
-      issuer
+      certificate: context.context.getCertificate(),
+      issuer: context.context.getIssuer()
     });
   }