Add block style variations to patterns

[reasterbrooknc]

As of 6.6 (July 16), block style variations will allow us to add a toggle for color variations on a given pattern—rather than having multiple patterns in the inserter. We can potentially eliminate a number of patterns in the inserter by implementing this toggle.

• Section Styling, Colorways, and Typesets for WP 6.6 WordPress/gutenberg#57537
• https://developer.wordpress.org/news/2024/06/21/styling-sections-nested-elements-and-more-with-block-style-variations-in-wordpress-6-6/

[reasterbrooknc]

This might need to wait for the next WP release for it to be ready for us to implement. Tentatively scheduling for December/1.3.

[reasterbrooknc]

Would likely require a rewrite of patterns, but it is worth experimenting to see if we can eliminate the quantity of pattern variations in the inserter. Would also be a change in UI—folks would select variation in the right sidebar rather than select an individual variation from the inserter.