Switching a PR from Draft to Undrafted Borks CI, Consider Setting 'Draft' Pr Checks Off

Checks are immediately canceled

despite no commits or code changes being pushed when a PR goes from draft to a non-draft PR. This is really annoying and causes a large amount of wasted runs as things have to rerun; https://github.com/dotnet/sdk/pull/55645 is a good example of this.

Reproduce the cancellation by changing the linked dotnet/sdk#55645 pull request from draft to ready without pushing commits, then inspect the checks and CI configuration involved. Done means the transition no longer cancels existing checks, or the requested draft-pull-request check behavior is clearly configured; the issue names no files or tests.

Written by the indexing model from the issue text.