Improve the UX of Model Registry Create button

Fred de Gierrequested to merge
480306-consolidate-create-model-actions-into-dropdown-button-for-pajamas-compliance into master

What does this MR do and why?

The code changes the appearance of a button in the model creation page. The button is now a primary button with a confirmation style, and its text is now "Create model".

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Related to #480306 (closed)

Edited by Fred de Gier

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