[torchft] Only reset_fr_recording_nccl if that attribute is available

[TimothySeah]

Otherwise this raises an exception when running a torchft training job in an environment without nccl e.g. cpu-only with gloo.

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[d4l3k]

LGTM

[meta-codesync]

@d4l3k has imported this pull request. If you are a Meta employee, you can view this in D95139843.