Display number of rollbacks performed in the rollback info dashboard

Reuben Pereirarequested to merge
rp/rollback-info-dashboard2 into master

Test dashboard: https://dashboards.gitlab.net/dashboard/snapshot/NRcBkyGxUh4aisLhPgHMjTWdueZdpAz8

Add panels displaying the number of rollbacks performed in gstg and gprd to the newly created Rollback Info dashboard.

gitlab-com/gl-infra/delivery#2022 (closed)

Edited by Reuben Pereira

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