Fix GH-16957: Assertion failure in array_shift with self-referencing array #16970
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We have an RC1 violation because we're immediately dereferencing and copying the resulting array in the test case. Instead, transfer the lifetime using ZVAL_COPY_VALUE and unwrap only after the internal iterator is reset.
Targeting 8.3 because it's an unlikely bug to hit and 8.2 is almost EOL.