Move the art-gtest-heap-poisoning from Valgrind to ASan.

The art-gtest-heap-poisoning used to *not* use Valgrind, but
eventually started to use it when the ART build/test configuration
list was moved to testrunner.py.

Having some memory instrumentation when exercising the heap poisoning
configuration makes sense, but Valgrind is expensive. Move this
configuration to using Address Sanitizer instead to save some test
resources.

Test: art/test/testrunner/run_build_test_target.py art-gtest-heap-poisoning
Bug: 72080484
Change-Id: I735d1bfa3b15e4939d51dda6d9096ee599586061