Add clean_gitlab_redis_shared_state to global_search_spec.rb

To clear shared redis state

ee/spec/elastic_integration/global_search_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe 'GlobalSearch', :elastic do
+RSpec.describe 'GlobalSearch', :elastic, :clean_gitlab_redis_shared_state do
   include AdminModeHelper
 
   let(:features) { %i(issues merge_requests repository builds wiki snippets) }