Blocks: Add missing apiVersion field when preparing server-registered blocks for the block editor

[gziolo]

When working on changes to @wordpress/create-block tool (​https://github.com/WordPress/gutenberg/pull/28883) to use register_block_type_from_metadata with block.json file in the templates for scaffolded blocks I run into this issue where apiVersion wasn't exposed from the server. This patch tries to address it.

I also double-checked that all necessary fields exposed in the REST API endpoint with block types are included get_block_editor_server_block_settings call that is eventually going to be deprecated in favor of the former. See the list for reference:
​https://developer.wordpress.org/rest-api/reference/block-types/

In the patch attached I also reordered the list of fields to match the REST API documentation.

[gziolo]

In 50297:

Blocks: Add missing apiVersion field when preparing server-registered blocks for the block editor

When working on changes to @wordpress/create-block tool (​https://github.com/WordPress/gutenberg/pull/28883) to use register_block_type_from_metadata with block.json file in the templates for scaffolded blocks I run into this issue where apiVersion wasn't exposed from the server.

Fixes #52512.

[gziolo]

In 50300:

Tests: Fix failing unit test for block settings

Follow-up to [50297].

Fixes #52512.