Tanzu sample certification documentation (#2059)

* adding sample doc for Tanzu Kubernetes Grid

* fix the doc based on Rosemary's review comments

* address Monica's review comments

* address Rosemary's review comments

* fianl edits

* last edits

* merged the ingress for both cluster and admin console

* changed the apiVersion for ingress and using the autodetect namespace
parameter

* label the domain namespace

Co-authored-by: Rosemary Marano <rosemary.marano@oracle.com>

Author: sankarpn