Windows Nanoserver Image Pre Stop Hook to Avoid 502 for Requests

The pods deployed to AKS gets terminated due to reschduling, low priority evictions as well as during scaled in. We can add a termination grase period and pre stop sleep time as shown below in Linux and Windows containers to allow, sufficient time to ingress services to get updated about terminating pods. However, Windows nanoserver does not support PowerShell. Therefore, we need to use a specific mechanism to pre stop hook for nanoserver images. For nanoserver images shutdown signal is correctly get sent to the dotnet app. So we can just setup a sllep time for pre stop hook as necessary.