[ET-VK][Ops] aten.tan.default in unary_ops

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #11047 by @ahmtox
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/ahmtox/3/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/ahmtox/3/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/ahmtox/2/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/ahmtox/3/orig
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[pytorch-bot]

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[SS-JIA]

I don't think we can land this PR since it is so old. If it's landed now, there will two definitions of the tan op, one in Tan.cpp and one in UnaryOp.cpp since this PR doesn't remove the Tan.cpp file. Note that Tan.cpp was relanded as part of D75920603 because the diff train couldn't link the landed PR to the original diff that was landed internally.

[psiddh]

Closing this PR based off comments from @SS-JIA