Change variant to confirm for import button

What does this MR do and why?

Updates the variant to confirm to match Pajamas guidelines

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Create a new project
2. Choose the import option
3. Select GitHub, and use a GitHub personal access token to import repos
4. View the import all button

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.