[3.14] gh-140657: Don't rerun test_import single phase init test (GH-140712) (#140713)

gh-140657: Don't rerun test_import single phase init test (GH-140712)

test_basic_multiple_interpreters_main_no_reset() leaks memory:
import_in_subinterp() is called with postcleanup=False.
(cherry picked from commit c6d4c79c9abac5c5cc2e7b429d72946d15c5e132)

Co-authored-by: Victor Stinner <vstinner@python.org>