Refactor safety net logic to ensure process exit after 30 seconds regardless of Node.js version

Author: rajbos

test/unit/vscode-shim-register.ts

@@ -307,10 +307,7 @@ try {
 	// ignore
 }
 
-// Safety net for Node < 22 which lacks --test-force-exit.
-// Without this, open handles (e.g. timers from imported extension code)
-// prevent the process from exiting after tests complete.
-const nodeMajor = parseInt(process.versions.node.split('.')[0], 10);
-if (nodeMajor < 22) {
-	setTimeout(() => process.exit(process.exitCode ?? 0), 30_000).unref();
-}
+// Safety net: force exit after 30 s if open handles (e.g. timers from
+// imported extension code) prevent the process from exiting after tests.
+// The timer is unref()'d so it won't keep the process alive on its own.
+setTimeout(() => process.exit(process.exitCode ?? 0), 30_000).unref();