[EPIC] Woo Block Hooks API (Phase 1)

[tjcafferkey]

Since the release of the Block Hooks API, WooCommerce has identified several high value use cases for this. However the API is still in its infancy so cautious adoption will help validate the API and help identify potential gaps to further its development.

The below task list reflects Phase 1.

Tasks

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1. Block Hooks API: Enable Mini Cart auto-insertion for TT3. #42752
   block: mini-cart team: Kirigami & Origami type: task +3
   
2. Block Hooks API: Enable Mini Cart auto-insertion for TT2. #42754
   block: mini-cart team: Kirigami & Origami type: task +3
   
3. Block Hooks API: Validate Woo Express themes to opt-in to Mini Cart auto-insertion. #42755
   block: mini-cart team: Kirigami & Origami type: task +3
   
4. Block Hooks API: Check if block isn't already present before auto-inserting. #42756
   block: mini-cart team: Kirigami & Origami type: task +3
   
5. Block Hooks API: Implement Customer block auto-insertion. #42757
   block: customer account team: Kirigami & Origami type: task +3
   
6. Block Hooks API: Abstract Mini Cart logic #43266
   block: mini-cart plugin: woocommerce team: Kirigami & Origami +3