grafana will now tpl datasources (helm#10603)

* grafana will now tpl datasources

Signed-off-by: James Batt <getjamesbatt@gmail.com>

* updated docs

Signed-off-by: James Batt <getjamesbatt@gmail.com>

* version bump

Signed-off-by: James Batt <getjamesbatt@gmail.com>