devops/azure: make ssl-redirect overridable to be closer to infra setup

When attempting to generate a helm chart via helm template, the ssl-redirect annotation is not overridable.

This MR aims to make it simpler to generate a helm chart closer to what is available in https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/blob/master/charts/osdu-common/templates/appgw-ingress.yaml