Enabling bias_dropout_add_fused with no bias term
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# What does this PR do ?

Specific LLM/VLM hang when using specific PP settings and with the bias term is set to false hang. By enabling a fused dropout_add_fused we should fix this problem as well as speed up training of LLM/VLM that do not have the bias term 

**Collection**:  nlp

# Changelog 
- Add specific line by line info of high level changes in this PR.
- nemo/collections/nlp/modules/common/megatron/transformer.py - Enabling the bias_dropout_add_fusion to be used for both bias and non bias enabled
- nemo/collections/nlp/modules/common/megatron/fused_bias_dropout_add.py - Check whether the bias term is there and choose relevant fused function

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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# Additional Information
* Related to #6396
