[ET-VK][ez] Make get_tensor() API protected

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][ez] Small optimization to DynamicDispatchNode #13119
• [ET-VK][BE] Move all ops to use DynamicDispatchNode #13098
• -> [ET-VK][ez] Make get_tensor() API protected #13097
• [ET-VK][BE] Remove usage of vTensorPtr and get_tensor #13096

Changes

As title; make the get_tensor() API protected.

Motivation

See the below diff/PR in the stack. The goal is to encourage operator authors to go through the ComputeGraph to access/modify tensors so that the activity can be tracked.

Differential Revision: D79564596

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13097

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• ROCm CI/CD workflows failing due to : download from https://api.github.com/repos/pytorch/pytorch timed out.

❌ 3 New Failures, 1 Unrelated Failure

As of commit 78a1dbc with merge base ec35f56 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• Propose to merge ghstack orig PRs to main / Try to create a PR with ghstack /orig branch (gh)
  Process completed with exit code 1.
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8992feb50152cb325aa1ad4cacba9eb4922dc742bf1208d35bf938846eb71bf6 /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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This pull request was exported from Phabricator. Differential Revision: D79564596

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This pull request was exported from Phabricator. Differential Revision: D79564596