Remove Members Area of Focus experiment

...cripts/invite_members/components/invite_members_modal.vue

app/assets/javascripts/invite_members/constants.js

...s/javascripts/invite_members/init_invite_members_modal.js

app/helpers/invite_members_helper.rb

app/services/members/create_service.rb

config/feature_flags/experiment/member_areas_of_focus.yml

doc/api/invitations.md

doc/api/members.md

lib/api/invitations.rb

lib/api/members.rb

locale/gitlab.pot

spec/features/groups/members/manage_members_spec.rb

...nd/invite_members/components/invite_members_modal_spec.js

spec/helpers/invite_members_helper_spec.rb

spec/requests/api/invitations_spec.rb

spec/requests/api/members_spec.rb

spec/services/members/create_service_spec.rb

spec/support/helpers/features/invite_members_modal_helper.rb