Stage group error budget detail dashboards

Sean McGivernrequested to merge
stage-group-error-budget-exploration-dashboard into master

This creates a way of generating a details dashboard per stage group, like the existing stage group dashboards.

https://dashboards.gitlab.net/dashboard/snapshot/S4XvUPXMHGVRrvYwIph1ilBBz35zJ4YS?orgId=1

First part of gitlab-com/gl-infra/scalability#1365.

Edited by Sean McGivern

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