feat(runtimes): add AMD ROCm torch distributed runtime ref #2335

[JEETDESAI25]

What this PR does / why we need it:

Adds AMD ROCm PyTorch distributed training runtime, enabling distributed training on AMD GPUs (e.g., MI300X accelerators). This follows the same pattern as the existing NVIDIA torch runtime added in #2328, using the official rocm/pytorch image with a pinned version matching the PyTorch version used in the NVIDIA runtime (2.7.1).

Which issue(s) this PR fixes :

#2335

Checklist:

• [ ] Docs included if any changes are user facing

[google-oss-prow[bot]]

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[JEETDESAI25]

/assign @andreyvelich