Quarantine flaky tests

'https://gitlab.com/gitlab-org/gitlab/-/issues/332078'

ee/spec/features/boards/sidebar_deprecated_spec.rb

@@ -39,7 +39,7 @@ RSpec.describe 'Issue Boards', :js do
   end
 
   context 'assignee' do
-    it 'updates the issues assignee' do
+    it 'updates the issues assignee', quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/332078' do
       click_card(card2)
 
       page.within('.assignee') do

ee/spec/features/boards/sidebar_spec.rb

@@ -65,7 +65,7 @@ RSpec.describe 'Issue Boards', :js do
       expect(card2).to have_selector('.avatar')
     end
 
-    it 'adds multiple assignees' do
+    it 'adds multiple assignees', quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/332078' do
       click_card(card1)
 
       page.within(assignees_widget) do