Merge branch 'axil-deprecations-links' into 'master'

Update the deprecations guidelines to mention removals as well

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124969



Merged-by: Suzanne Selhorn <sselhorn@gitlab.com>
Approved-by: Sam Wiskow <swiskow@gitlab.com>
Approved-by: Suzanne Selhorn <sselhorn@gitlab.com>
Reviewed-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Achilleas Pipinellis <axil@gitlab.com>