Blocks: use a single source of truth for blocks metadata

[monsieur-z]

Following #32408, a block.json metadata file was created for each block so that wp.org could list them on the Jetpack plugin page. However, the block registration methods in both the back and front ends don't consider these files yet: they read metadata from an object that's exported in a JS file. Metadata is duplicated.

The recommended method for block registration is to specify a path to a block.json file. We should try that and get rid of data that's not present in that file.

Tasks

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1. Enable block registration by specifying the path to block.json #32697
   [Package] Blocks [Plugin] Jetpack [Pri] Normal [Tests] Includes Tests [Type] Enhancement +5
   
2. Switch all Beta blocks to be registered via their block.json file
3. Refactor: register business hours block with block.json path #32698
   RNA [Block] Business Hours [JS Package] Shared Extension Utils [Package] Blocks [Plugin] Jetpack [Tests] Includes Tests +6
   
4. Refactor beta blocks registration #32815
   RNA [Block] AI Chat [Block] Amazon [Block] Blogroll [Block] Business Hours [Block] Create With Voice [Block] Google Docs Embed [Block] Recipe [JS Package] Shared Extension Utils [Package] Blocks [Plugin] Jetpack [Tests] Includes Tests +12
   
5. Refactor registration of experimental blocks #33073
   [Block] AI Image [Block] AI Paragraph [Plugin] Jetpack +3
   
6. Fix Blogroll block icon #33076
   [Block] Blogroll [Plugin] Jetpack +2
   
7. Blocks: Switch all Production blocks to be registered via their block.json file #33174
   7 of 7
   [Focus] Blocks [Pri] Normal [Type] Janitorial +3
   
8. Use consistent phrasing in block descriptions #32603
   [Focus] Blocks [Plugin] Jetpack [Pri] Normal [Type] Enhancement +4
   
9. Find a strategy to have up-to-date block info in Jetpack.com #32604
   [Focus] Blocks [Plugin] Jetpack [Pri] Low [Status] Wontfix [Type] Enhancement +5
   
10. Update jetpack CLI command to generate new blocks using block.json #33173
    [Focus] Blocks [Pri] Normal [Tools] Development CLI [Type] Enhancement +4
    
11. Switch all Experimental blocks to be registered via their block.json file