Draft: loki update to 6.18.0-bb.2

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/loki/-/blob/6.18.0-bb.2/CHANGELOG.md

Package MR

big-bang/product/packages/loki!288 (merged)

For Issue

Closes big-bang/product/packages/loki#213

Upgrade Notices

N/A