Remove accidental EE additions in CE

ee/app/controllers/ee/ldap/omniauth_callbacks_controller.rb

-module EE
-  module Ldap
-    module OmniauthCallbacksController
-      extend ::Gitlab::Utils::Override
-
-      override :sign_in_and_redirect
-      def sign_in_and_redirect(user)
-        # The counter gets incremented in `sign_in_and_redirect`
-        show_ldap_sync_flash if user.sign_in_count == 0
-
-        super
-      end
-
-      private
-
-      def show_ldap_sync_flash
-        flash[:notice] = 'LDAP sync in progress. This could take a few minutes. '\
-                         'Refresh the page to see the changes.'
-      end
-    end
-  end
-end

ee/spec/controllers/ldap/omniauth_callbacks_controller_spec.rb

-require 'spec_helper'
-
-describe Ldap::OmniauthCallbacksController do
-  include_context 'Ldap::OmniauthCallbacksController'
-
-  it "displays LDAP sync flash on first sign in" do
-    post provider
-
-    expect(flash[:notice]).to match(/LDAP sync in progress*/)
-  end
-
-  it "skips LDAP sync flash on subsequent sign ins" do
-    user.update!(sign_in_count: 1)
-
-    post provider
-
-    expect(flash[:notice]).to eq nil
-  end
-
-  context 'access denied' do
-    let(:valid_login?) { false }
-
-    it 'logs a failure event' do
-      stub_licensed_features(extended_audit_events: true)
-
-      expect { post provider }.to change(SecurityEvent, :count).by(1)
-    end
-  end
-end