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Add test for array zip_to_iter2 early termination

Successfully covers the uncovered line 301 in array/array.mbt:
- Tests early termination when yield function returns IterEnd
- Verifies proper iterator behavior with zip operations
- Fixed unused variable warning

Coverage improved from 768 to 767 uncovered lines (1 line now covered).
This test ensures the early termination path in zip_to_iter2 is properly exercised.