Type annotation polishing for symbols around Pytester.run (#8298)
Type annotation polishing for symbols around Pytester.run (#8298)

* Type annotation polishing for symbols around Pytester.run

Hopefully these will help document readers understand pertinent methods
and constants better.

Following up #8294

* Use NOTSET instead of object
nicoddemus/pytest,nicoddemus/pytest,pytest-dev/pytest,markshao/pytest,RonnyPfannschmidt/pytest,Akasurde/pytest