[3.12] gh-109613: _pystat_fromstructstat() checks for exceptions (GH-109618) (#109641)

gh-109613: _pystat_fromstructstat() checks for exceptions (GH-109618)

Fix os.stat() and os.DirEntry.stat(): check for exceptions.
Previously, on Python built in debug mode, these functions could
trigger a fatal Python error (and abort the process) when a function
succeeded with an exception set.

_pystat_fromstructstat() now exits immediately if an exception is
raised, rather only checking for exceptions at the end. It fix
following fatal error in fill_time():

    Fatal Python error: _Py_CheckSlotResult:
    Slot * of type int succeeded with an exception set
(cherry picked from commit d4cea794a7b9b745817d2bd982d35412aef04710)

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

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