[3.12] gh-105699: Disable the Interpreters Stress Tests (gh-107354) (gh-107357)

gh-105699: Disable the Interpreters Stress Tests (gh-107354)

The two tests are crashing periodically in CI and on buildbots.  I suspect the problem is in the _xxsubinterpreters module.
 Regardless, I'm disabling the tests temporarily, to reduce the noise as we approach 3.12rc1.  I'll be investigating the crashes separately.
(cherry picked from commit 4f67921ad28194155e3d4c16255fb140a6a4d89a)

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>