[ET-VK] Migrate to use new q8ta_conv2d ops #1908

Job	Run time
export-model-cuda-windows-artifact (mistralai, Voxtral-Mini-3B-2507, quantized-int4-weight-only) / linux-job	28m 55s
export-model-cuda-windows-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job	28m 22s
export-model-cuda-windows-artifact (nvidia, parakeet-tdt, quantized-int4-weight-only) / linux-job	23m 36s
export-model-cuda-windows-artifact (nvidia, parakeet-tdt, non-quantized) / linux-job	23m 8s
	1h 44m 1s

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