GOOWOO-749 remove beta product editor

[mserino]

Changes proposed in this Pull Request:

Closes GOOWOO-749.

Background

WooCommerce is retiring the beta block-based product editor (@woocommerce/product-editor) in WC 11.0 (targeting July 28, 2026), with deprecation warnings starting in WC 10.9. This PR removes all integration code before that deadline to avoid breakage.

What was removed

• The js/src/blocks/ directory — five custom blocks that extended the beta product editor with a "Google for WooCommerce" tab
• ProductBlocksService.php — handled asset registration and block template injection for the beta editor
• ChannelVisibilityBlock.php — registered the channel visibility block type with the WooCommerce block registry
• Registrations for both classes in CoreServiceProvider.php
• The blocks webpack entry point and --webpack-src-dir=js/src/blocks from build scripts
• @woocommerce/product-editor and @woocommerce/block-templates from .externalized.json
• Associated unit and E2E tests

Screenshots:

Detailed test instructions:

Verify the classic editor still works

• Open any product in the classic editor (wp-admin → Products → Edit).
• Confirm the Channel visibility sidebar metabox and the Google for WooCommerce product data tab render correctly.
• Save the product and confirm values persist.
• No JS console errors.

Verify the beta editor integration is gone (WC < 11.0 only)

• Enable the beta product editor: WooCommerce → Settings → Advanced → Features → "New product editor".
• Open any product — confirm there is no "Google for WooCommerce" tab and no related blocks.
• No JS console errors about a missing blocks.js script.

Additional details:

Changelog entry

Dev - Remove beta block-based product editor integration ahead of its retirement in WooCommerce 11.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.5%. Comparing base (99adf60) to head (828caa0).
⚠️ Report is 11 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##             develop   #3542     +/-   ##
===========================================
- Coverage       67.7%   66.5%   -1.1%     
+ Complexity      5322    5283     -39     
===========================================
  Files            518     911    +393     
  Lines          21453   28066   +6613     
  Branches           0    1720   +1720     
===========================================
+ Hits           14513   18669   +4156     
- Misses          6940    9136   +2196     
- Partials           0     261    +261     

Flag	Coverage Δ
js-unit-tests	64.1% <ø> (?)
php-unit-tests	67.3% <ø> (-0.4%)	⬇️

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

Files with missing lines	Coverage Δ
...ernal/DependencyManagement/CoreServiceProvider.php	0.0% <ø> (ø)

... and 402 files with indirect coverage changes

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[asvinb]

LGTM @mserino . Thanks!. Can you add the changelog please? Thanks!

[asvinb]

@mserino I just noticed there are some E2E tests which we may need to remove with any associated utils.
tests/e2e/specs/product-editor/block-integration.test.js

Can you check please?

[asvinb]

LGTM @mserino ! Thanks!