Set QuantLib benchmark guide as draft

Mark the QuantLib benchmark guide as a draft and add cascading draft status.

Author: pareenaverma

content/learning-paths/servers-and-cloud-computing/quantlib/_index.md

@@ -1,5 +1,10 @@
 ---
 title: Benchmark QuantLib on Azure Cobalt
+
+draft: true
+cascade:
+    draft: true
+    
 description: Learn how to build QuantLib on an Arm-based Azure Cobalt virtual machine and run benchmark workloads to evaluate performance on Arm64 cloud infrastructure.
 
 minutes_to_complete: 60
@@ -55,4 +60,4 @@ further_reading:
 weight: 1
 layout: "learningpathall"
 learning_path_main_page: "yes"
----
+---