Autocompleters: Consider block category

[tyxla]

Description

In #9999 we updated the inserter to respect the block categories when searching. This PR applies the update to the block autocompleters, which allows us to use the slash inserter with a block category, revealing all the blocks from that category.

How has this been tested?

• Start a new post.
• In a new paragraph block type /CATEGORY where CATEGORY is one of the block categories (common, formatting, 'layout, widgets`, etc.)
• Verify that all the blocks under that category appear in the list.

Screenshots

Types of changes

• Now considering category when searching for blocks in slash inserter / block autocompleters.
• Added tests to verify we consider the category in autocompleters.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.

[jorgefilipecosta]

LGTM 👍 I tested the default configuration and I used filters to register custom categories and in both cases, the tests went well.

[mtias]

Once concern here is that it is not clear at all what the search is matching for to the user, specially for partial matches. There's already an issue for this regarding aliases of blocks.

cc @jasmussen @alexislloyd

[jasmussen]

Yes, this is tricky, and we've already had some challenges around this with a search for "Image" that also matches a gallery. And because we sort by frequently used, the 2nd time you search for /image and press enter if you just inserted a gallery, you'll get an image.

I think we should start work on #5643 before we expand this search further. Ideally when you type /image and press Enter, you should always get an image. Once we have that in place, we have a good baseline.

In the case of this PR, I get the purpose behind it, but the challenge is the same. I can easily imagine a block existing called "Layout", which would confuse this search even further.