Create specific CE display_public_email? user helper

FOSS was failing because of calling display_public_email?
which did not exist in CE. This adds a CE specific helper
method to avoid failures.

Changelog: fixed

app/helpers/users_helper.rb

@@ -173,10 +173,7 @@ module UsersHelper
   end
 
   def display_public_email?(user)
-    return false if user.public_email.blank?
-    return true unless user.provisioned_by_group
-
-    !Feature.enabled?(:hide_public_email_on_profile, user.provisioned_by_group)
+    user.public_email.present?
   end
 
   private

ee/app/helpers/ee/users_helper.rb

@@ -2,6 +2,16 @@
 
 module EE
   module UsersHelper
+    extend ::Gitlab::Utils::Override
+
+    override :display_public_email?
+    def display_public_email?(user)
+      return false if user.public_email.blank?
+      return true unless user.provisioned_by_group
+
+      !::Feature.enabled?(:hide_public_email_on_profile, user.provisioned_by_group)
+    end
+
     def users_sentence(users, link_class: nil)
       users.map { |user| link_to(user.name, user, class: link_class) }.to_sentence.html_safe
     end

ee/spec/models/user_detail_spec.rb

@@ -10,11 +10,11 @@ RSpec.describe UserDetail do
 
     subject { user.user_detail.provisioned_by_group? }
 
-    it 'returns true when user is provisoned by group' do
+    it 'returns true when user is provisioned by group' do
       expect(subject).to eq(true)
     end
 
-    it 'returns true when user is provisoned by group' do
+    it 'returns true when user is provisioned by group' do
       user.user_detail.update!(provisioned_by_group: nil)
 
       expect(subject).to eq(false)

spec/helpers/users_helper_spec.rb

@@ -11,6 +11,20 @@ RSpec.describe UsersHelper do
     badges.reject { |badge| badge[:text] == 'Is using seat' }
   end
 
+  describe 'display_public_email?' do
+    let_it_be(:user) { create(:user, :public_email) }
+
+    subject { helper.display_public_email?(user) }
+
+    it { is_expected.to be true }
+
+    context 'when user public email is blank' do
+      let_it_be(:user) { create(:user, public_email: '') }
+
+      it { is_expected.to be false }
+    end
+  end
+
   describe '#user_link' do
     subject { helper.user_link(user) }