[ET-VK][qconv2d][ez] Don't use im2col path for general convs

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][profiling] Add additional profiling blocks #17394
• -> [ET-VK][qconv2d][ez] Don't use im2col path for general convs #17393
• [ET-VK] Add nchw_to_int8x4_buffer shader for prepacking int8 staging data #17392
• [ET-VK] Layout-flexible impl of quantized binary #17391
• [ET-VK][ez] Make q8ta_conv2d use 4C1W layout #17390
• [ET-VK][ez] Add AOT support for PackedInt8_4C1W dtype #17389
• [ET-VK] Migrate to use new q8ta_conv2d ops #17388
• [ET-VK][qconv] Dynamically select between im2col path and general path #17387
• [ET-VK][qconv][ez] Make q8ta_im2col shader support stride_w != 1 #17386
• Back out "[Diff Train][pytorch/executorch] Apply fixup patch to fbsource" #17399

This removes the dynamic dispatch logic in q8ta_conv2d() that selected between the im2col and general convolution paths. The function now unconditionally uses q8ta_conv2d_general(). This simplifies the dispatch since the im2col path selection will be handled upstream by the pattern matcher routing to specialized ops (q8ta_conv2d_pw, q8ta_conv2d_dw, etc.) instead of being decided at runtime.

Differential Revision: D93000164

[pytorch-bot]

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❌ 3 New Failures, 1 Unrelated Failure

As of commit ec26244 with merge base 964c565 ():

NEW FAILURES - The following jobs have failed:

• pull / test-vulkan-operators-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 124a79c6c81b227f9a73390f5b8d9b78ab4c020d2ba0c8ac8eba64161af2c637 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 606cf2ea25a1e2ca82a3d990af551dbd9531c7754b2ab912604634041cd8e7ce /exec failed with exit code 1
• Test CUDA Windows Export / export-model-cuda-windows-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 7d6b0da3332f28cf240887d96acee63a66d9ee4d0e811192aa2fbd0ff3000352 /exec failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-samsung-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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