Re-base loki chart off of upstream loki-simple-scalable

With all the updates and new 1.X based version of loki-simple-scalable it comes with features that the current BigBang chart tried to incorporate out-of-band like Grafana Enterprise Logs, Minio & centralized config ...configuration. Re-base the BigBang chart off of loki-simple-scalable version 1.7.6 and ensure that value transparency to Package CI, BB CI, and Production configurations are as transparent as possible.