Implement delivery_deployment_started_total metric

Alessio Caiazzarequested to merge
track-deployment-started into master

What does this MR do?

This MR implements the new delivery_deployment_started_total metric.

A new set of CI jobs are included to increment this metric when we deploy to a given environment.

Related to: gitlab-com/gl-infra/delivery#1964 (closed)

Edited by Alessio Caiazza

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