Resolve CE/EE diffs in new group member view

Part of single codebase changes.

app/helpers/groups/group_members_helper.rb

+# frozen_string_literal: true
+
+module Groups::GroupMembersHelper
+  def group_member_select_options
+    { multiple: true, class: 'input-clamp', scope: :all, email_user: true }
+  end
+end

app/views/groups/group_members/_new_group_member.html.haml

 = form_for @group_member, url: group_group_members_path(@group), html: { class: 'users-project-form users-group-form' } do |f|
   .row
     .col-md-4.col-lg-6
-      = users_select_tag(:user_ids, multiple: true, class: 'input-clamp', scope: :all, email_user: true)
+      = users_select_tag(:user_ids, group_member_select_options)
       .form-text.text-muted.append-bottom-10
         Search for members by name, username, or email, or invite new ones using their email address.
 

spec/helpers/groups/group_members_helper_spec.rb

+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe Groups::GroupMembersHelper do
+  describe '.group_member_select_options' do
+    let(:group) { create(:group) }
+
+    before do
+      helper.instance_variable_set(:@group, group)
+    end
+
+    it 'returns an options hash' do
+      expect(helper.group_member_select_options).to include(multiple: true, scope: :all, email_user: true)
+    end
+  end
+end