loki update to 5.31.0-bb.2

Package Merge Request

Package Changes

Ensuring service templates for all components are following what istio and documentation recommends to handle GRPC as raw TCP traffic

https://istio.io/latest/docs/ops/configuration/traffic-management/protocol-selection/

https://grafana.com/docs/loki/latest/setup/install/istio/

Package MR

big-bang/product/packages/loki!111 (merged)

For Issue

Closes out bug