[CI] Add HUD link to parity summary

[ethanwee1]

Summary

Add a clickable HUD LINK to the parity report summary so users can jump from the GitHub Actions run to the matching PyTorch HUD page.

For PR runs, the link points to the PR HUD page with the exact SHA used for the report, e.g. https://hud.pytorch.org/pytorch/pytorch/pull/<pr_id>?sha=<sha>. For SHA-only runs, the link points to the commit HUD page.

Validation

• PR-only example: triggered parity.yml with pr_id=184377, arch=mi355, and no SHA. The report resolved SHA 291ff45ffe10a301a88d1a83e98b9ba9987dbbfa, so the HUD link is https://hud.pytorch.org/pytorch/pytorch/pull/184377?sha=291ff45ffe10a301a88d1a83e98b9ba9987dbbfa. Run passed: https://github.com/ROCm/pytorch/actions/runs/26476256833
• SHA-only example: triggered parity.yml with sha=fe1b0a2ae93e0efcfa0defeee2ed879cf68eaac6, arch=mi355, and no PR ID. Run passed: https://github.com/ROCm/pytorch/actions/runs/26475135922

[rocm-repo-management-api]

Jenkins build for b80bb58f414b63186f9984824a98ca37b257c228 commit finished as NOT_BUILT
Links: Pipeline Overview / Build artifacts / Test Results

Detected error during Pytorch building:

HIP VERSION: 7.2.53211-c2d9476115
CMake Warning (dev) at /opt/rocm/lib/cmake/hip/hip-config-amd.cmake:98 (message):
   GPU_TARGETS was not set, and system GPU detection was unsuccsessful.
   
   The amdgpu-arch tool failed:
   Error: 'Failed to get device count'
   Output: ''
   
   As a result, --offload-arch will not be set for subsequent
   compilations, and the default architecture
   (gfx906 for dynamic build / gfx942 for static build) will be used

[rocm-repo-management-api]

Jenkins build for b80bb58f414b63186f9984824a98ca37b257c228 commit finished as FAILURE
Links: Pipeline Overview / Build artifacts / Test Results