Follow-up from "rails integration branch for "Remote Development Integration Branches""

The following discussion from !105783 (merged) should be addressed:

• @splattael started a discussion:

  Question Looking at https://docs.gitlab.com/ee/development/gotchas.html#why I see some concerns regarding the use of any_instance_of. Can we ensure that we are safe in this case and create an issue to find a solution which does involve this call? 🙏