chore: Add Memorystore stackdriver exporter in gprd

Furhan Shabirrequested to merge
chore/add-stackdriver-exporter-for-memorystore-gprd into master

What

Add stackdriver exporter for Memorystore for Redis instances in staging

Why

To be able to export stackdriver metrics from GCP for Memorystore for Redis in staging.

Reference issue: gitlab-com/gl-infra/tenant-scale/tenant-services/team#188

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