[ET-VK][conv2d_dw] Fix test requesting nonexistent sned b1x1 shader

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] Add dynamic-shape resize to q8ta ops #20312
• -> [ET-VK][conv2d_dw] Fix test requesting nonexistent sned b1x1 shader #20343

The test_conv2d_dw benchmark aborted on device (SIGABRT) with an uncaught vkcompute::vkapi::Error from ShaderRegistry::get_shader_info: "Could not find ShaderInfo with name conv2d_dw_sned_output_tile_3x3_b1x1_float". pick_conv2d_dw_shader_with_selector in TestConv2dDw.cpp appended the _b1x1 batch-tile infix for any 3x3 case whenever impl_selector == "b1x1", with no stride_equals_dilation guard. For a strided 3x3 case it had already appended _sned, producing conv2d_dw_sned_output_tile_3x3_b1x1_float — a variant the sned shader family never generates (sned shaders are not batch-tiled; only the non-sned conv2d_dw_output_tile family has _b1x1 variants).

This guards the forced _b1x1 append on stride_equals_dilation, matching the production pick_conv2d_dw_shader in Conv2dDW.cpp. A forced b1x1 selector on a strided 3x3 case now falls back to the existing un-suffixed sned shader instead of requesting an unbacked variant.

Differential Revision: D108916041

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• pull / test-phi-3-mini-runner-linux / linux-job (gh)
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• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh)
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