Fix #31573, prevent ARM64 SymmQgemm int16 overflow

[Sylvester Kaczmarek (sylvesterkaczmarek)]

Widen each 8-lane int8 product group into the int32 accumulators before multiplying the second half of the packed K block. This avoids the signed int16 overflow that occurs when two -128 * -128 products share a halfword lane.

Enable the existing signed-input regression coverage on non-dotprod ARM64 now that the plain NEON path is corrected.

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