Merge branch '503306-drop-namespace_details-pending_delete-column' into 'master'

Drop namespace_details.pending_delete column

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/173383



Merged-by: Eugenia Grieff <egrieff@gitlab.com>
Approved-by: Max Woolf <mwoolf@gitlab.com>
Approved-by: Michał Zając <mzajac@gitlab.com>
Approved-by: Sam Figueroa <sfigueroa@gitlab.com>
Approved-by: Eugenia Grieff <egrieff@gitlab.com>
Co-authored-by: Shane Maglangit <smaglangit@gitlab.com>