This aims to fix STUD-2093

This should be manually tested against the following xblock types in studio and lms:
- [ ] conditional
- [ ] sequence
- [ ] split test

It should also be tested against:
- [ ] bulk email
- [ ] email on instructor dashboard
- [ ] email on legacy instructor dashboard
I wanted to be able to handle the case where perhaps you don't know what the request token is going to be (for instance, an xblock might use a handler to render one of it's children, or something crazy like that, and end up w/ a different request token).