add flash-attn deterministic option to flash-attn>=2.4.1
Author: junrae6454
Pull request: yes

# What does this PR do?
This PR introduces support for the deterministic mode available in Flash Attention version 2.4.1 and above. 
The deterministic mode in Flash Attention 2.4.1 ensures reproducible results, which is crucial for debugging and scientific research. By integrating this feature, users can benefit from deterministic behavior in their models.
The changes include enabling deterministic behavior through an environment variable and integrating this feature into the _flash_attention_forward function. 


* Flash Attention Forward Function Update:
  * Added deterministic parameter to _flash_attention_forward to control deterministic behavior.
  * Modified the function to check for Flash Attention version 2.4.1 or higher and set the deterministic argument accordingly.

* Trainer Utilities Update:
  * Set the FLASH_ATTENTION_DETERMINISTIC environment variable in enable_full_determinism.

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Comments:
> sounds good! are there other args we should be reading from env ?

@ArthurZucker 
Other changes are related to the model structure and the model's return value, so there doesn't seem to be anything else that needs to be read from the environment.