Product Block Editor: Convert Label component and custom block registration to use the newly added APIs in Woo 8.5

[eason9487]

Changes proposed in this Pull Request:

To be compatible with Product Block Editor and to use Woo core APIs as much as possible, this PR converts a few codes to rely on Woo 8.5:

• Use Woo's product block template API to register custom blocks. (Ref: woocommerce#41937)
• Replace the copied Label component with the one imported from @woocommerce/product-editor. (Ref: woocommerce#42959)

Screenshots:

📷 Label of the Product select with text field block

📷 Label of the Product select field block

Detailed test instructions:

📌 Prepare test environment

1. Please refer to the test preparation in PR 2151 with Woo 8.5.0.
   • Currently, it can be tested with 8.5.0-rc.1
2. npm install
3. npm start

📌 Test the changes

1. Install WooCommerce Brands and activate it.
2. Go to edit a variable product, e.g. the Hoodie imported from WC's sample products.
3. Switch to the Google Listings & Ads tab.
4. Check if there are only two attributes in the Product attributes sections and if the attributes can access their product data.
   • There are features specific to the product block template and they require specific block attributes such as _templateBlockHideConditions and usesContext to make them work.
   • The _templateBlockHideConditions is for conditional hiding a block.
   • The use of usesContext is explained here.
   • After removing _templateBlockHideConditions from block.json files, attributes that are not applicable for variable product should still be hidden, e.g. Color.
   • After removing the usesContext from block.json files, the accessing of attributes should still work well.
5. Hover on the question icon of Brand (Product select with text field block) to see if the label content shows up.
6. Hover on the question icon of Adult content (Product select field block) to see if the label content shows up.

Changelog entry

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (34ca9e8) 60.9% compared to head (2d84378) 61.6%.
Report is 30 commits behind head on feature/support-product-block-editor.

Additional details and impacted files

@@                           Coverage Diff                            @@
##             feature/support-product-block-editor   #2193     +/-   ##
========================================================================
+ Coverage                                    60.9%   61.6%   +0.7%     
- Complexity                                   4151    4152      +1     
========================================================================
  Files                                         453     453             
  Lines                                       17847   16602   -1245     
========================================================================
- Hits                                        10870   10223    -647     
+ Misses                                       6977    6379    -598     

Flag	Coverage Δ
php-unit-tests	61.6% <0.0%> (+0.7%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/Menu/MenuFixesTrait.php	0.0% <ø> (ø)
google-listings-and-ads.php	7.7% <0.0%> (+1.4%)	⬆️
src/Google/GlobalSiteTag.php	0.0% <0.0%> (ø)
src/Admin/ProductBlocksService.php	0.0% <0.0%> (-95.3%)	⬇️

... and 107 files with indirect coverage changes

[tomalec]

Thanks for the changes and updated explanations :)
I tested it locally with WC 8.5.0-rc.1, reviewed the code, LGTM!