[ET-VK] Register aten.repeat in partitioner, add aten.sqrt

[yipjustin]

Stack from ghstack (oldest at bottom):

• -> #3510

As title, also fixed some nit in the unittest.

Differential Revision: D56961340

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As of commit 91e0e07c33c83532b8bcceb1a4ab6b3641086f6f with merge base b9488fe9d41fe5190641f323f3f6a5295e86256c (): :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: D56961340

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This pull request was exported from Phabricator. Differential Revision: D56961340

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This pull request has been merged in pytorch/executorch@5e425c39c519382e87587f82558e0d2150f43142.