b10777

<details open>

sycl: reduce redundant work in Q4_K multi-column MMVQ (#27062)

* sycl: Q4_K Weight unpack optimization and reuse between destination Columns

* sycl: Q4_K small N (N=2..4) + two output rows by subgroup reuse of activation between two rows.

* sycl: gate Q4_K two-row reuse for small N=2

* sycl: Fix on magic number now uses Q4_K_MMVQ_ROW_PAIR_MIN_NROWS=6272 for it, added tests for coverage around Q4_K_MMVQ_ROW_PAIR_MIN_NROWS with perf support to test Q4_K MUL_MAT, applied the same  reuse pattern to the activation as the weights.

Assisted-by: GPT-5.6 Sol

---------

Co-authored-by: RaulAbejonDelgado <raul.abejon.delgado@gmail.com>

</details>

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