fixup! Add ROCm pytest workflow to nightly/release CI
Update ROCm job to use GCS downloads and match CUDA workflow pattern.
Changes:
- Remove parameters: jax-version, github-release-tag, download-jax-from-pypi
- Change jaxlib-version from github_release to head
- Add gcs_download_uri parameter from workflow inputs
- Rename skip-download-jaxlib-and-rocm-plugins to skip-download-jaxlib-and-rocm-plugins-from-gcs
- ROCm plugins now downloaded from ROCm/jax-plugin latest release
