Point to network-health list instead of metrics-team

The metrics-team list is gone (see: tpo/network-health/team#99 (closed)), we should therefore point to the network-health list instead.

added Doing label

assigned to @gk

mentioned in merge request !4 (merged)

closed with commit cec72279

mentioned in commit a369c21b

mentioned in issue tpo/network-health/team#99 (closed)