grafana update to 7.2.1-bb.3

Package Merge Request

Package Changes

Change cypress css and dataid to match coreDNS as testing in cypress health test

Package MR

big-bang/product/packages/grafana!50 (merged)

For Issue

Closes big-bang/product/packages/grafana#18 (closed)

Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)