Upgrade KEDA to 2.1.0 to support scaling of Stateful Sets

Need to upgrade KEDA to 2.1.0 to support scaling of stateful sets which is used as part of airflow workers in AKS cluster

Upgrade details

Steps to upgrade KEDA

Upgrading KEDA helm chart from 1.5.0 to 2.1.1 is not straight forward, below are the steps which are needed to be executed to upgrade it successfully

Need to remove existing ScaledObject and TriggerAuthentication resources existing in AKS cluster
Uninstall current KEDA version which is 1.5.0
Delete KEDA CRD's (you can fetch KEDA CRDS using kubectl get crd | grep keda)
Install KEDA helm chart version 2.1.1

For reference about upgrading KEDA refer to this link - https://keda.sh/docs/2.1/migration/