Replace old references of users_project & users_group

app/controllers/profiles/notifications_controller.rb

app/controllers/projects/team_members_controller.rb

app/models/project.rb

app/models/user.rb

app/views/admin/projects/show.html.haml

app/views/groups/_new_group_member.html.haml

app/views/groups/members.html.haml

app/views/profiles/notifications/show.html.haml

app/views/projects/team_members/_group_members.html.haml

app/views/projects/team_members/index.html.haml

lib/tasks/gitlab/check.rake

spec/factories/users_groups.rb

spec/models/group_member_spec.rb

spec/models/group_spec.rb

spec/models/project_member_spec.rb

spec/models/project_spec.rb

spec/models/user_spec.rb