Exclude log_outputs() from execute profiling scope (#6325)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/6325

`log_outputs()` should not be included in the `execute()` profiling scope as it distorts the profiling numbers especially on smaller embedded platforms like Xtensa.

Reviewed By: mcremon-meta

Differential Revision: D64541740

fbshipit-source-id: 82e3a3be82cb8a4ed6f37fa9eddbf0240876d675