Loki upstream reconcile

Description

Updating the loki package to the new upstream location https://github.com/grafana/loki/tree/main/production/helm/loki

This includes changes in nomenclature such as monolith -> singleBinary.

BB MR

https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/2188

Issues

Relates to https://repo1.dso.mil/platform-one/big-bang/apps/sandbox/loki/-/issues/27