text: Title: freeze Method in BackboneFinetuning Missing train_bn Argument
  Body: ### Bug description
  
  In BackboneFinetuning, which extends BaseFinetuning, the freeze_before_training method calls self.freeze(pl_module.backbone). However, the freeze method requires an additional train_bn argument to properly handle batch normalization layers.
  
  
  Affected File
  File: pytorch-lightning/src/lightning/pytorch/callbacks/finetuning.py
  Class: BackboneFinetuning
  Method: freeze_before_training
  
      @override
      def freeze_before_training(self, pl_module: "pl.LightningModule") -> None:
          self.freeze(pl_module.backbone)  # Missing `train_bn`
  
  ### What version are you seeing the problem on?
  
  v2.5
  
  ### How to reproduce the bug
  
  ```python
  
  ```
  
  ### Error messages and logs
  
  ```
  # Error messages and logs here please
  ```
  
  
  ### Environment
  
  <details>
    <summary>Current environment</summary>
  
  ```
  #- PyTorch Lightning Version (e.g., 2.5.0):
  #- PyTorch Version (e.g., 2.5):
  #- Python version (e.g., 3.12):
  #- OS (e.g., Linux):
  #- CUDA/cuDNN version:
  #- GPU models and configuration:
  #- How you installed Lightning(`conda`, `pip`, source):
  ```
  
  </details>
  
  
  ### More info
  
  _No response_