Fastlane update (#28356)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28356
### Summary
I'm working on setting up a benchmark test project for iOS, which will reuse this Fastlane file. This PR removes the "cert install" code from "before_all" to a standalone lane target.
### Test Plan
- don't break any existing CI jobs
Test Plan: Imported from OSS
Differential Revision: D18053675
Pulled By: xta0
fbshipit-source-id: e4760a8494916c410af19ca43f040fc463551d11
