[ET-VK][EZ] Migrate convolution workgroup API

[jorgep31415]

Stack from ghstack (oldest at bottom):

• -> #3996

• 3995

The expectation these days is to always use the ComputeGraph API; we've just been lazy with migration. Doing convolution now since I'm playing with the workgroup size.

Differential Revision: D58681683

[pytorch-bot[bot]]

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As of commit 106fb11eb0ba4fefdbec15c8b1c0370cd7e5874e with merge base bcabc3757bda66c86aea493ea1b59e37351206ad (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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This pull request was exported from Phabricator. Differential Revision: D58681683

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This pull request was exported from Phabricator. Differential Revision: D58681683

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This pull request has been merged in pytorch/executorch@99284c735fade83cefc15951c4cefcc2776444c8.