Merge branch '496539_remove_ff' into 'master'

Remove `go_get_handle_401_error` feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168338



Merged-by: Vasilii Iakliushin <viakliushin@gitlab.com>
Approved-by: Gavin Hinfey <ghinfey@gitlab.com>