Refactor production blocks registration 3

[monsieur-z]

• See Blocks: use a single source of truth for blocks metadata #32602
• See Blocks: Switch all Production blocks to be registered via their block.json file #33174

Proposed changes:

Registers the following production blocks by specifying the path to their block.json file: Mailchimp, Map, Markdown, OpenTable, Payment Buttons.

This was made possible by #32697. The goal is to avoid the duplication of block metadata and use block.json as the source of truth.

In more details, for each block (when needed):

• Write reading direction-agnostic CSS
• Remove the editorScript property from block.json (automatically added during the build)
• Convert icon from dashicon to SVG in the icon property of block.json
• Remove icon.js
• Import icon helpers from the shared-extension-utils package
• Register the block client and server sides with block.json
• Move data from index.js to block.json and editor.js and delete the file
• Move data from attributes.js to block.json and delete the file
• Fix JS tests

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

pedMtX-RS-p2

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

• Spin up a test site
• Create a new post and open the block inserter
• Test that the aforementioned blocks behave as in trunk. This PR shouldn't change anything from a user's standpoint.

Note: the Map block is currently broken on trunk. This PR fixes it: #33606.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the refactor/production-blocks-registration-3 branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack refactor/production-blocks-registration-3
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

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[jeherve]

This one will need a rebase as well, I'm afraid.