Remote FF `ff_wiki_file_content_security`

What does this MR do and why?

Close #4255 (closed)

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jh/app/controllers/concerns/jh/wiki_actions.rb

@@ -12,17 +12,9 @@ module WikiActions
     def send_wiki_file_blob(wiki, file_blob)
       return super unless ::ContentValidation::Setting.block_enabled?(wiki)
 
-      if ::Feature.enabled?(:ff_wiki_file_content_security, wiki.container)
-        content_blocked_state = ::ContentValidation::ContentBlockedState.find_by_container_file_path(
-          wiki,
-          file_blob.path)
-      else
-        commit = wiki.repository.commit(wiki.default_branch)
-        content_blocked_state = ::ContentValidation::ContentBlockedState.find_by_container_commit_path(
-          wiki,
-          commit&.id,
-          file_blob.path)
-      end
+      content_blocked_state = ::ContentValidation::ContentBlockedState.find_by_container_file_path(
+        wiki,
+        file_blob.path)
 
       return super unless content_blocked_state.present?