Adds header to model detail page

What does this MR do and why?

Adds improved tab structure for model detail page

1. Placeholder while description field is being added on !134443 (merged)
2. Shows the correct number of versions, but the versions itself will be added in a different MR
3. Placeholder content, more will be added on this tab (artefacts, metadata, readme, etc)
4. Placeholder

Screenshots or screen recordings

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Before	After

How to set up and validate locally

1. On rails console, enable the feature flag and create some data

   Feature.enable("model_registry")
   p = Project.find_by(id: 20) # or whatever project you want to use for testing
   version = Ml::FindOrCreateModelVersionService.new(p, { model_name: "model_1", version: "1.0.0" }).execute
   version.model.present.path

2. Navigate to the path

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.

Related to #428308 (closed)