[ET-VK][conv1d] Route conv1d to height-packed implementations in export pipeline

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][CI] Add test-vulkan-genai job for Parakeet on NVIDIA GPU runner #18335
• -> [ET-VK][conv1d] Route conv1d to height-packed implementations in export pipeline #18334
• [ET-VK][conv1d] Implement height-packed depthwise conv1d operator #18333
• [ET-VK][conv1d] Implement height-packed pointwise conv1d operator #18332

Integrate the new height-packed conv1d_pw and conv1d_dw operators into the
aten.convolution.default dispatch path so they are automatically used during
model export.

In op_registry.py, add a pick_conv_storage function that inspects the
convolution node at partition time. For 1D convolutions where the op is
pointwise (kernel_size=1) or depthwise (groups=C_in) and channels are 4-aligned,
it selects HEIGHT_PACKED_TEXTURE for input/output instead of the default
CHANNELS_PACKED_TEXTURE. All other cases (conv2d, grouped conv1d with K>1,
unaligned channels) retain channels-packed behavior.

In Convolution.cpp, add a height-packed routing block at the top of the conv1d
path. When the input tensor is height-packed, it dispatches to
et_vk.conv1d_pw.default or et_vk.conv1d_dw.default via VK_GET_OP_FN. Falls
through to the existing channels-packed add_conv1d_node path otherwise.

Differential Revision: D97344090

[pytorch-bot]

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 036f144 with merge base 7c79395 ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner-mypy (gh)

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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