Do not hard-code the incident cost calculator dashboard to the `main` stage

Andrew Newdigaterequested to merge
include-stage-variable-in-incident-spent-dashboard into master

At present, SLA is hardcoded for the main stage.

Having a template variable to allow the stage to be selected may provide more insight into "canary-only" incidents.

https://dashboards.gitlab.net/dashboard/snapshot/Ee19XLo9rOTIelB8BocZZVMOtEHvY5kw?orgId=1&var-PROMETHEUS_DS=Global&var-environment=gprd&var-stage=cny&from=now-24h&to=now

At present, the SLA for cny is very poor, but this will be addressed in gitlab-com/gl-infra/delivery#940 (closed)

image

Edited by Andrew Newdigate

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