Your using a version control system, just delete me. They are trivial to get back.
While you are at it, remove all the "abandoned" directories since that is very
confusing when trying to understand how the codebase works.
These tests are special because they refer to a subject in contention. I would like to have them around for a little bit, even if they are not run as part of the build.
Broken tests are just deleted, as you suggested.