Model registry: Improve UX for models and model versions tables

What does this MR do and why?

This MR changes the position of the actions ellipsis for both models table and model versions table.

References

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MR acceptance checklist

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Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

1. Open GDK: http://127.0.0.1:3000/flightjs/Flight/-/ml/models
2. Create model if one doesn't exist, give it a model name click Create
3. Click on the models index http://127.0.0.1:3000/flightjs/Flight/-/ml/models
4. Verify that the screen is in accordance with the screenshot

Numbered steps to set up and validate the change are strongly suggested.

Related to #503984 (closed)