refactor(policies): Remove unnormalization step from action predictions

- Eliminated the unnormalization of actions in both `TDMPCPolicy` and `VQBeTPolicy` classes to streamline action prediction.
- This change improves code clarity and aligns with recent updates to policy processors.

Author: AdilZouitine

src/lerobot/policies/tdmpc/modeling_tdmpc.py

@@ -129,7 +129,6 @@ def predict_action_chunk(self, batch: dict[str, Tensor]) -> Tensor:
 
         actions = torch.clamp(actions, -1, +1)
 
-        actions = self.unnormalize_outputs({ACTION: actions})[ACTION]
         return actions
 
     @torch.no_grad()

src/lerobot/policies/vqbet/modeling_vqbet.py

@@ -118,7 +118,6 @@ def reset(self):
     def predict_action_chunk(self, batch: dict[str, Tensor]) -> Tensor:
         batch = {k: torch.stack(list(self._queues[k]), dim=1) for k in batch if k in self._queues}
         actions = self.vqbet(batch, rollout=True)[:, : self.config.action_chunk_size]
-        actions = self.unnormalize_outputs({ACTION: actions})[ACTION]
         return actions
 
     @torch.no_grad