loki update to 5.0.0-bb.0 & backend statefulset enabled by default

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/loki/-/blob/5.0.0-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/loki!74 (merged)

For Issue

Closes big-bang/product/packages/loki#44 (closed)