Sort conditional imports

[qgallouedec]

Minor consistency import sorting

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Note

Low Risk
Import reordering and formatting only; no training or runtime logic changes.

Overview
Reorders optional dependency imports (if is_*_available(): …) and tightens multi-line from … import lists to a single line in trainers, extras/profiling, models/activation_offloading, and related tests. The intent is a shared layout: optional blocks grouped with blank lines between them, and module-level logger / constants placed after those blocks where they were previously interleaved.

Test-only tweaks: drops a no-op is_peft_available() stub in test_gspo_token_trainer.py, and imports PEFTAdapterEMACallback unconditionally in test_self_distillation_trainer_behavior.py instead of nesting it inside the PEFT guard.

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[albertvillanova]

Thanks!

The CI is red. Do you know why the CI has been failing today apparently in a non-deterministic way?

[qgallouedec]

No idea!

[qgallouedec]

It seems like transient hub errors