Remove invite members in comment experiment

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

...ipts/invite_members/components/invite_members_trigger.vue

app/assets/javascripts/invite_members/constants.js

...ts/javascripts/vue_shared/components/markdown/toolbar.vue

app/controllers/projects/issues_controller.rb

app/controllers/projects/merge_requests_controller.rb

...ig/feature_flags/experiment/invite_members_in_comment.yml

locale/gitlab.pot

spec/controllers/projects/issues_controller_spec.rb

spec/controllers/projects/merge_requests_controller_spec.rb

spec/features/issues/user_invites_from_a_comment_spec.rb

...eatures/merge_request/user_invites_from_a_comment_spec.rb

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

.../invite_members/components/invite_members_trigger_spec.js

spec/frontend/vue_shared/components/markdown/toolbar_spec.js