Move search application settings to the correct CE or EE edition
Description
This is a follow-up from !177265 (merged). We are moving the snippet, issues, and epics search application settings to CE or EE as we use them.
This merge request was initially created because we noticed we call to the feature flag checks from CE via lib/api/search.rb#L75 to global_search_enabled_for_scope?. The fix to that is to move the feature flag checks to the right place: CE or EE, instead of having all the accessor in CE.
I will update this merge request only to move the accessors to CE or EE, and create a separate merge request !178888 (merged) to fix the incorrect feature flags under EE.
Related to #511347 (closed)
Edited by Arturo Herrero