[GONRG-4134] Added keycloak to osdu-infra-onprem chart
Used chart:
- https://github.com/bitnami/charts/tree/master/bitnami/keycloak
- https://artifacthub.io/packages/helm/bitnami/keycloak
Added redirect to virtual service. Added NOTES.txt to templates/
Edited by Danylo Vanin (EPAM)