[3.12] Display the sanitizer config in the regrtest header. (GH-105301) by miss-islington · Pull Request #105342 · python/cpython

Display the sanitizers present in libregrtest.

Having this in the CI output for tests with the relevant environment
variable displayed will help make it easier to do what we need to
create an equivalent local test run.
(cherry picked from commit 852348a)

Co-authored-by: Gregory P. Smith <greg@krypto.org>