[BE] Add S3 bucket argument to number of workflows (#121907)
Namely, it adds the `s3-bucket` argument to the following workflows, with default value set to `gha-artifacts`):
- _docs
- _linux-test workflows
- download-build-artifacts
- pytest-cache-download
- upload-test-artifacts
This is prerequisite part is required in order to start migrating to other s3 buckets for asset storage; This is one of the required steps in order to migrate to ARC and move our assets away from our S3 to Linux Foundation S3
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121907
Approved by: https://github.com/malfet
