Prior to this work, when async tasks that process the request are cancelled due
to receiving an early "http.disconnect" ASGI message, the request_finished
signal was not being sent, potentially leading to resource leaks (such as
database connections).
This branch ensures that the request_finished signal is sent even in the case
of early termination of the response.
Regression in 64cea1e48f.
Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>
Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>