Update Gatekeeper: Remove PSPs (deprecated in 1.22)

Package Merge Request

Package Changes

Disables PSPs by default, since they were deprecated in 1.22.

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/merge_requests/129

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/policy/-/issues/151