added changelog

changelogs/unreleased/40291-ignore-hashed-repos-cleanup-repositories.yml

+---
+title: Ensure that rake gitlab:cleanup:repos task does not mess with hashed repositories
+merge_request: 15520
+author:
+type: fixed

changelogs/unreleased/40352-ignore-hashed-repos-cleanup-dirs.yml

+---
+title: Ensure that rake gitlab:cleanup:dirs task does not mess with hashed repositories
+merge_request: 15600
+author:
+type: fixed