Merge branch 'ap-group-sort-by-attribute' into 'master'

Fix Group sort_by_attribute method

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167121



Merged-by: Siddharth Dungarwal <sdungarwal@gitlab.com>
Approved-by: Tarun Vellishetty <tvellishetty@gitlab.com>
Approved-by: Siddharth Dungarwal <sdungarwal@gitlab.com>
Co-authored-by: Alex Pooley <apooley@gitlab.com>