[Asan] Ensure minimum stack size 128KB in ThreadedStressStackReuseTest (#165198)
Asan test `ThreadedStressStackReuseTest ` fails on AIX due to smaller
default thread stack size. Set thread stack size to a minimum of 128KB
to ensure reliable test behavior across platforms (platforms with
smaller default thread stack size).
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Co-authored-by: Riyaz Ahmad <riyaz.ahmad@ibm.com>