Fix CI: torch_xla ABI compatibility and Sphinx parallel build race condition

[Copilot]

CI failures identified in workflow run #21624638173: TPU tests failing with ABI incompatibility error, docs build failing with transient Sphinx connection errors.

Changes

.github/workflows/tpu-tests.yml

• Replace hardcoded wheel URL with torch_xla[tpu] package format to enable proper dependency resolution

# Before: hardcoded wheel causes ABI mismatch
pip install https://storage.googleapis.com/pytorch-xla-releases/wheels/tpuvm/torch_xla-nightly-cp310-cp310-linux_x86_64.whl

# After: package format resolves compatible versions
pip install --pre 'torch_xla[tpu]' -f https://storage.googleapis.com/libtpu-releases/index.html -f https://storage.googleapis.com/libtpu-wheels/index.html

.github/workflows/docs.yml

• Add retry logic to doctest job (3 attempts, 15min timeout) to handle Sphinx -j auto parallel build race conditions
• Pattern matches existing retry mechanism in TPU test workflow

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/pytorch/ignite/commits/214fd44969122085a717feb684e9992471d94813/check-runs
  • Triggering command: /usr/bin/curl curl -s -H Accept: application/vnd.github.v3+json REDACTED (http block)
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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