Guard timeout early if we cannot actually set it

[muellerzr]

What does this PR do?

This PR checks if a user has tried setting timeout in the InitProcessGroupKwargs and the environment isn't setup for this to actually work in an NCCL-based multiprocess system

Fixes # (issue)

Fixes #2236

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@SunMarc

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[SunMarc]

LGTM ! Thanks for adding this