Add deprecation entry for "Deprecate scanResultPolicies GraphQL field"

upstream mr title: Add deprecation entry for "Deprecate scanResultPolicies GraphQL field"

upstream mr link: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/176793

upstream mr target branch: master

upstream mr milestone: Backlog

upstream mr merged at: 2025-01-04 03:46:20 +0800