Merge branch 'sranasinghe-deprecate-backup-pg-schema' into 'master'

Deprecate backup_pg_schema setting

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141123



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Gabriel Mazetto <brodock@gmail.com>
Reviewed-by: Achilleas Pipinellis <axil@gitlab.com>