Displays model description

What does this MR do and why?

We had a placeholder for the description of a model, now connecting to the actual description

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. In rails console enable the feature flag

   Feature.enable(:model_registry)

2. Create a model and a bunch of candidates

   p = Project.find_by_id(1)
   m = Ml::FindOrCreateModelService.new(p, "model_1", nil, "Cool description").execute

3. Navigate to <gdk>/<project>/-/ml/models and select the model. Verify that the new description shows up.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.