[ExecuTorch] Arm Ethos: Option to be verbose for Vela (#8546)

[ExecuTorch] Arm Ethos: Always verbose all for Vela

Pull Request resolved: https://github.com/pytorch/executorch/pull/8406

Better to have the output then to have to rerun it.
ghstack-source-id: 266959633
@exported-using-ghexport

Differential Revision: [D69503726](https://our.internmc.facebook.com/intern/diff/D69503726/)

Co-authored-by: Digant Desai <digantdesai@meta.com>