TestEncDecMultiTaskModel for canary parallel
[🤖]: Hi @karpnv 👋,

I just wanted to let you know that, you know, a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/11166342670) for this PR just finished successfully ✨

So it might be time to merge this PR or like to get some approvals 🚀

But I'm just a 🤖 so I'll leave it you what to do next.

Have a great day! 

//cc @ko3n1g
# Fix tests for TestEncDecMultiTaskModel

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

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?
@pzelasko 

# Additional Information
* Related to # (issue)
