fix excessive update updating could_be_locked

fixes CANVAS-KQVF, LF-566

Change-Id: I2ce19e5bca2570ad1a4bfddc3f0542532f992cb0
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/324597
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Jake Oeding <jake.oeding@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

app/models/content_tag.rb

@@ -208,8 +208,10 @@ class ContentTag < ActiveRecord::Base
       klass = type.constantize
       next unless klass < ActiveRecord::Base
 
-      if klass.new.respond_to?(:could_be_locked=)
-        klass.where(id: ids).update_all_locked_in_order(could_be_locked: true)
+      next unless klass.new.respond_to?(:could_be_locked=)
+
+      ids.sort.each_slice(1000) do |slice|
+        klass.where(id: slice).update_all_locked_in_order(could_be_locked: true)
       end
     end
   end