Make a backward compatibility for old MSDD configs in label models
# What does this PR do ?

This PR is revision of the old PR https://github.com/NVIDIA/NeMo/pull/9182.

TitaNet model was updated but some previous configurations were not. 
This PR provides support for prevevious msdd configuration versions.  

**Collection**: SD

# Changelog 
- Catch the `_target_` code in newer titanet versions, which is not available in previous versions. 


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**PR Type**:
- [ ] New Feature
- [x] Bugfix
- [ ] Documentation
