alerts: Fix grafana trace link
The trace link was based on the panel ID, but it got messy after adding v2 traces.
Let's change it to a safer approach of specifying the
trace name via var-trace
argument with the viewPanel
one to maximize
the chart.
Example with fixed trace links: https://gitlab.freedesktop.org/gallo/mesa/-/issues/21#note_1543249
Edited by Guilherme Gallo