Add empty sub to fix node 18 addBind

Author: uurien

packages/dd-trace/src/appsec/rasp/fs-plugin.js

@@ -35,6 +35,10 @@ class AppsecFsPlugin extends Plugin {
     this.addBind('apm:fs:operation:finish', this._onFsOperationFinishOrRenderEnd)
     this.addBind('tracing:datadog:express:response:render:start', this._onResponseRenderStart)
     this.addBind('tracing:datadog:express:response:render:end', this._onFsOperationFinishOrRenderEnd)
+    // TODO Remove this when dc-polyfill is fixed&updated
+    //  hack to node 18 and early 20.x
+    //  with dc-polyfill addBind is not enough to force a channel.hasSubscribers === true
+    this.addSub('tracing:datadog:express:response:render:start', () => {})
 
     super.configure(true)
   }