Add aws-actions authentication to linux_job_v2.yml #7115
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Some runners do not have AWS CLI installed. Hence, in PyTorch we rely on github aws-actions instead of the CLI for authentication. To provide support for workflow files using linux_job_v2.yml, added aws-actions authentication to linux_job_v2.yml.
It is needed to get torchtitan PR going pytorch/torchtitan#1260. It currently faces issue with https://github.com/pytorch/torchtitan/actions/runs/16353043263/job/46204468985?pr=1260#step:8:221