Remove codesigning from ios circleci workflows (#85630)
This PR is a follow up to https://github.com/pytorch/pytorch/pull/85597 which removes codesigning from our github action workflows. This is a synonymous change to our circleci workflows. Since we only run TestApp on simulator we don't need to have this codesigning logic. (And more pressingly, these dev cert is expiring at the end of the month and we don't have a replacement)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85630
Approved by: https://github.com/atalman, https://github.com/malfet
