fix: Check if captureRequestSession is available before its called (getsentry#3773)

* Check the presence of _captureRequestSession before calling it

Author: dfcook

packages/node/src/handlers.ts

@@ -433,7 +433,8 @@ export function requestHandler(
         const client = currentHub.getClient<NodeClient>();
         if (isAutoSessionTrackingEnabled(client)) {
           setImmediate(() => {
-            if (client) {
+            // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+            if (client && (client as any)._captureRequestSession) {
               // Calling _captureRequestSession to capture request session at the end of the request by incrementing
               // the correct SessionAggregates bucket i.e. crashed, errored or exited
               // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access