[ET-VK][ez] properly parse skip memory metadata pass (#6723)

Pull Request resolved: https://github.com/pytorch/executorch/pull/6712

As title. Currently, the compile option to skip memory metadata tagging is not being passed correctly to `vulkan_preprocess`.
ghstack-source-id: 252359943
@exported-using-ghexport

Differential Revision: [D65600049](https://our.internmc.facebook.com/intern/diff/D65600049/)

Co-authored-by: Stephen Jia <ssjia@meta.com>