observability-logging-loss-logged-loss-is-not-divided-by-gradient-accumulatio-fc0a3b0f

THEN Modify the `_maybe_log_save_evaluate` method to accept the number of gradient accumulation steps (`ga_steps`). When computing the logged loss, divide `tr_loss_scalar` by `ga_steps` before dividing by the number of steps since last log. This ensures the reported loss accurately reflects the per-step loss rather than the accumulated loss over multiple gradient accumulation steps.

In the `_maybe_log_save_evaluate` function, add a parameter `ga_steps` and change the loss computation from:
`logs["loss"] = round(tr_loss_scalar / (self.state.global_step - self._globalstep_last_logged), 4)`
to:
`logs["loss"] = round(tr_loss_scalar / ga_steps / (self.state.global_step - self._globalstep_last_logged), 4)`
Also update the call sites to pass `self.args.gradient_accumulation_steps` or the number of batches completed in the current step.