Monitoring and alerts for Rococo/Westend (#2710) (#2718)

* Monitoring and alerts for Rococo/Westend

* 00000001 -> 00000002

* Backup actual version

* Upload "Rococo BEEFY dashboard" from grafana (I cannot find it)

* Separated Rococo Beefy dashboard and alerts

* Group Rococo BEEFY alerts + add `Rococo` labels

* Renamed evaluation group `Bridges` -> `Bridge Rococo <> Wococo`

* Updated Wococo -> Westend dashboards

* Rococo<>Westend alerts

* Fixed matrix_room for rococo beefy

* Removed "refId": "B" for rewards lags and set condition A > 10 + fixed time range

* Delivery race dashboard from now-5m -> now-6h

* Removed rococo-wococo

* Less than 500 Westend headers have been synced to RococoBridgeHub in last 120 minutes -> 390