Adds multi-select to categories on Latest Posts

[Ringish]

Description

Adds possibility to add & select posts in LatestPosts by multiple categories as described in #20046.

How has this been tested?

Added a couple of posts and categories, and used the new implementation to test, edit and save.

Screenshots

Types of changes

Adds ability to filter by multiple categories. May be breaking change? Probably this could break blocks with the old implementation.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[draganescu]

Great work @Ringish :) Left some comments about the code. As a general note i advise you to follow the setup in the code contribution guide to benefit from automatic linting and early problem detection.

Setting up locally Docker and the @wordpress/wp-env package will also allow you to run failing tests locally and debug.

Looking forward for testing this again after you've went through my suggestions! 🚀

[Ringish]

Great work @Ringish :) Left some comments about the code. As a general note i advise you to follow the setup in the code contribution guide to benefit from automatic linting and early problem detection.

Setting up locally Docker and the @wordpress/wp-env package will also allow you to run failing tests locally and debug.

Looking forward for testing this again after you've went through my suggestions! 🚀

Really good feedback. Thank you! I've pushed a new commit.

[draganescu]

Tested this locally by filtering on multiple categories and LGTM!

[paaljoachim]

Will we still see the list of possible categories below the multiselect box?
So we know which categories we can choose from.

[draganescu]

@paaljoachim not at this point, no. That is a disatvantage of this tokenized system. When implementing such a system you basically trat categories like tags and type two letters to get a fuzzy match list.

On another note, I will open an issue to move the control token select to QueryControls to respect the current implementation style.

[draganescu]

We should rename suggestions to categorySuggestions

[mcsf]

The change of attribute schema for this block here should have been accompanied with provisions for migration, especially considering that this is a dynamic block.