Centralize avatar size
Multiple files are setting the avatar size to 40
- https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/views/shared/members/_member.html.haml#L15
- https://gitlab.com/gitlab-org/gitlab/-/blob/9f5edd913a66eab72f707b8d6408d3f011b3b332/app/helpers/groups/group_members_helper.rb#L6 - Introduced on !40548 (merged)
We can re-use the constant defined in Groups::GroupMembersHelper on the member.html.haml partial.
Edited by Mayra Cabrera