Merge branch '370306-feature-flag-enable-present_groups_select_all' into 'master'

Remove present_groups_select_all feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116748



Merged-by: Vasilii Iakliushin <viakliushin@gitlab.com>
Approved-by: Nicolas Dular <ndular@gitlab.com>
Approved-by: Vasilii Iakliushin <viakliushin@gitlab.com>
Reviewed-by: Nicolas Dular <ndular@gitlab.com>
Co-authored-by: Alex Pooley <apooley@gitlab.com>