gh-96021: Explicitly close the IsolatedAsyncioTestCase runner in tests#96135
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Tests for IsolatedAsyncioTestCase.debug() rely on the runner be closed
in
__del__. It makes tests depending on the GC an unreliable on otherimplementations. It is better to close the runner explicitly even if
currently there is no a public API for this.
It does not fixgh-96021, it only uses a workaround until we find better solution (which perhaps could not be backported).