Changeset 49981 for trunk/tests/phpunit/data/blocks/notice/block.json

Blocks: Add i18n support to register_block_type_from_metadata

Related Gutenberg issue: ​https://github.com/WordPress/gutenberg/issues/23636.
Related WP-CLI PR: ​https://github.com/wp-cli/i18n-command/pull/210.
Related documentation proposal: ​https://github.com/WordPress/gutenberg/blob/master/docs/designers-developers/developers/block-api/block-metadata.md#internationalization-not-implemented

Adds programatic i18n support to register_block_type_from_metadata function for block settings registered from block.json file that provides textdomain field.

Props swissspidy, ocean90.
Fixes #52301.