Remove feature flag for SAML sign in to GitLab.com

ee/app/controllers/groups/omniauth_callbacks_controller.rb

@@ -82,24 +82,6 @@ class Groups::OmniauthCallbacksController < OmniauthCallbacksController
     Gitlab::Auth::GroupSaml::User.new(oauth, @saml_provider)
   end
 
-  override :sign_in_user_flow
-  def sign_in_user_flow(auth_user_class)
-    # User has successfully authenticated with the SAML provider for the group
-    # but is not signed in to the GitLab instance.
-
-    if sign_in_to_gitlab_enabled?
-      super
-    else
-      flash[:notice] = "You must be signed in to use SAML with this group"
-
-      redirect_to new_user_session_path
-    end
-  end
-
-  def sign_in_to_gitlab_enabled?
-    ::Feature.enabled?(:group_saml_allows_sign_in_to_gitlab, @unauthenticated_group)
-  end
-
   override :fail_login
   def fail_login(user)
     if user

ee/changelogs/unreleased/jej-unflag-group-saml-sign-in-to-dot-com.yml

+---
+title: Group SAML can be used to sign into a GitLab instance
+merge_request: 12660
+author:
+type: added

ee/spec/controllers/groups/omniauth_callbacks_controller_spec.rb

@@ -188,20 +188,6 @@ describe Groups::OmniauthCallbacksController do
         end
       end
 
-      context 'identity linked but sign in flow disabled' do
-        before do
-          create_linked_user
-          stub_feature_flags(group_saml_allows_sign_in_to_gitlab: false)
-        end
-
-        it 'prevents sign in' do
-          post provider, params: { group_id: group }
-
-          expect(flash[:notice]).to start_with('You must be signed in')
-          expect(response).to redirect_to('/users/sign_in')
-        end
-      end
-
       it_behaves_like "and identity already linked"
     end
   end