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

[SS-JIA]

Stack from ghstack (oldest at bottom):

• -> [ET-VK][ez] Small optimization to DynamicDispatchNode #13159
• [ET-VK][BE] Move all ops to use DynamicDispatchNode #13158
• [ET-VK][ez] Make get_tensor() API protected #13157
• [ET-VK][BE] Remove usage of vTensorPtr and get_tensor #13156

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/13159

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❌ 2 New Failures, 4 Unrelated Failures

As of commit 5d6635d with merge base 6bc312a ():

NEW FAILURES - The following jobs have failed:

• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t 341326d56efab5da018f1f0656390439954e45b5cf3591486bfe3cb997c624dc /exec failed with exit code 1
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4306452014b9406eee219ffea820179d6d80153ed48a8552bcbe565032681ea8 /exec failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-linux-android / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-models-linux (resnet18, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' 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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This pull request was exported from Phabricator. Differential Revision: D79605482