fix: change janus import into automodel import

[llcnt]

Description

This PR makes use and replace the JanusForConditionalGeneration by a AutoModelForImageTextToText : in case there is a package version mismatch, only the Janus test would fail with some model-not-available-error.

Related Issue

The previous PR #145 on janus introduced some test that yields import error if the transformers is outdated.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Local test on Janus pass

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes