Hide the Query Loop block from the inserter

[priethor]

What problem does this address?

The Query Loop block is arguably one of the most advanced blocks out there, and its complexity can intimidate and cause frustration to less advanced users.

What is your proposed solution?

Once #37080 is in place, the Query Loop block should be hidden from the inserter unless advanced users specifically search for it. This way, less advanced users will get exposed to the Query Loop block only through patterns and its block variations, such as Posts List, but the block will still be available for power users.

[annezazu]

👋🏼 On today's hallway hangout with the FSE Outreach Program, this came up and it was suggested to actually rename the Pattern category to something more user friendly and I wanted to connect some dots by following up here for future reference. I can see how doing so would be problematic as it would likely lead to more folks adding in a complex block that they then aren't equipped to customize. This is ideally where having query loop variations power things like the post list will be very high impact though as I can imagine then patterns can be created using these easier to use blocks instead.