[BE] Migrate pull.yml to use S3 pytorch-ci-artifacts bucket for linux-jammy-py3_8-gcc11 and docs builds/tests (#121908)
Switch to use LF S3 bucket for pull on linux-jammy-py3_9-gcc and docs jobs. This is required to migrate to ARC and move to use LF resources.
Depends on https://github.com/pytorch/pytorch/pull/121907
Follow up issue https://github.com/pytorch/pytorch/issues/121919
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121908
Approved by: https://github.com/malfet
