Add client.tls.insecureSkipVerify: true to the Grafana CR to account for deployments with self-signed certs

[chilanti]

When the ansible playbook is used on an OCP cluster that exposes self-signed certificates, the operator fails to create the datasources and the dashboards with an error that indicates that the certificates are signed by an unknown authority. This behavior can be avoided by adding client.tls.insecureSkipVerify: true to the Grafana CR (grafana.j2).