Upload Apple iOS benchmark results to benchmark database (#5982)

Summary:
Do the same for iOS benchmark, there is no JSON output atm, so I parse the test spec output directly

### Testing
https://github.com/pytorch/executorch/actions/runs/11239684907

Pull Request resolved: https://github.com/pytorch/executorch/pull/5982

Reviewed By: guangy10

Differential Revision: D64062513

Pulled By: huydhn

fbshipit-source-id: c1fb9c659fbbcdcd1c4704ece6fa054409ba57d7