[ET-VK][ez] Small optimization to DynamicDispatchNode

[kirklandsign]

Stack from ghstack (oldest at bottom):

• -> [ET-VK][ez] Small optimization to DynamicDispatchNode #13139
• [ET-VK][BE] Move all ops to use DynamicDispatchNode #13138
• [ET-VK][ez] Make get_tensor() API protected #13137
• [ET-VK][BE] Remove usage of vTensorPtr and get_tensor #13136

Changes

Update DynamicDispatchNode constructor so that pick_global_wg_fn does not need to be called multiple times.

Differential Revision: D79605482

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13139

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 2362a36 with merge base b054e8d ():

NEW FAILURE - The following job has failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t ea47340779d9ba0aa3e0e47e97f2eff334f38c539374eeb448766431821bc794 /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-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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