[Patterns] Add new Testimonials: 3 columns pattern

[albarin]

This PR implements the Testimonials: 3 columns pattern.

Fixes #9151

Screenshots

Design

Testing

User-Facing Testing

1. Create a new page or post
2. Make sure the Testimonials 3 columns pattern appears under the WooCommerce category dropdown.
3. Insert in and make sure it shows as expected on the design.

• Do not include in the Testing Notes

WooCommerce Visibility

• WooCommerce Core
• Feature plugin
• Experimental

Add new Testimonials 3 columns pattern

[github-actions]

The release ZIP for this PR is accessible via:

https://wcblocks.wpcomstaging.com/wp-content/uploads/woocommerce-gutenberg-products-block-9159.zip

Script Dependencies Report

There is no changed script dependency between this branch and trunk.

This comment was automatically generated by the ./github/compare-assets action.

TypeScript Errors Report

• Files with errors: 452
• Total errors: 2217

🎉 🎉 This PR does not introduce new TS errors.

_{comments-aggregator}

[github-actions]

Size Change: 0 B

Total Size: 1.1 MB

ℹ️ View Unchanged

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[roykho]

Tested well as describe! 🚢