Add exclude_unreviewed param to GET /api/v2/search REST API (#11977)

Make it so normal search returns even unreviewed matches, but
autosuggestions do not.

Fix #11960

app/controllers/api/v2/search_controller.rb

@@ -22,7 +22,7 @@ class Api::V2::SearchController < Api::BaseController
       params[:q],
       current_account,
       limit_param(RESULTS_LIMIT),
-      search_params.merge(resolve: truthy_param?(:resolve))
+      search_params.merge(resolve: truthy_param?(:resolve), exclude_unreviewed: truthy_param?(:exclude_unreviewed))
     )
   end