When creating review requests from existing commits, we now copy the

data into a new review request draft instead of into the review request.

This has the effect of showing the draft banner when creating the review

request (previously, the review request would have to be edited to

create a draft) and allowing publishing immediately (if there are

default reviewers). Unit tests have been updated to reflect this new

behaviour.

Created a review request through post-commit UI. The banner appeared

  immediately and I was able to submit it.
Ran unit tests.