Revert "Change search API to be accessible without being logged in (#18963)"

This reverts commit 4207f3d8fc.

app/controllers/api/v2/search_controller.rb

@@ -5,7 +5,8 @@ class Api::V2::SearchController < Api::BaseController
 
   RESULTS_LIMIT = (ENV['MAX_SEARCH_RESULTS'] || 20).to_i
 
-  before_action -> { authorize_if_got_token! :read, :'read:search' }
+  before_action -> { doorkeeper_authorize! :read, :'read:search' }
+  before_action :require_user!
 
   def index
     @search = Search.new(search_results)
@@ -23,7 +24,7 @@ class Api::V2::SearchController < Api::BaseController
       params[:q],
       current_account,
       limit_param(RESULTS_LIMIT),
-      search_params.merge(resolve: user_signed_in? ? truthy_param?(:resolve) : false, exclude_unreviewed: truthy_param?(:exclude_unreviewed))
+      search_params.merge(resolve: truthy_param?(:resolve), exclude_unreviewed: truthy_param?(:exclude_unreviewed))
     )
   end