gatekeeper update to 3.15.0-bb.7

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/policy/-/blob/3.15.0-bb.7/CHANGELOG.md

Package MR

big-bang/product/packages/policy!229 (merged)

big-bang/product/packages/policy!230 (merged)

For Issue

Closes big-bang/product/packages/policy#220 (closed)

Upgrade Notices

N/A