feat: Allow Configuration of Custom Fields to be Searchable

[tamvt]

This pull request introduces a new feature that allows custom fields to be marked as searchable on a per-field basis, rather than being searchable by default. This change optimizes search index size and performance, especially for stores with many custom fields. The UI has been updated to support toggling the "Include in search" option for product custom fields, and relevant backend and frontend logic, tests, and translations have been added or updated to support this functionality.

Key changes:

Custom Field Searchability Feature:

• Custom fields are now not searchable by default; a new "Include in search" toggle has been added to the custom field detail modal for product custom fields. Enabling this option requires reindexing for existing fields. [1] [2] [3] [4]
• UI components and snippets updated to support the new searchability toggle and display informational banners when the search status changes. [1] [2] [3] [4] [5]
• Default value for includeInSearch is set to false for new custom fields, and the value is preserved for existing fields. [1] [2]

Search Configuration and Filtering:

• The custom field search configuration UI and backend now filter custom fields to only show those with includeInSearch = true. [1] [2]
• Corresponding tests added to ensure filtering by includeInSearch works as expected.

Admin UI update:

Backend Support:

• New event subscriber service CustomFieldSearchableSubscriber registered to handle backend logic related to searchable custom fields.

[explore-openapi]

OpenAPI Snapshot

Project: shopware/store-api

No changes detected

Your OpenAPI schema is identical to the base branch (trunk).

Links:
All Project Snapshots · Base Branch Snapshot

Project: shopware/admin-api

Changes detected: 2 total
0 additions · 0 removals · 2 modifications

Diff: https://explore-openapi.dev/diff#...

Links:
All Project Snapshots · Base Branch Snapshot

[codecov]

Codecov Report

❌ Patch coverage is 93.40659% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.44%. Comparing base (6e242bc) to head (7f9f115).
⚠️ Report is 1 commits behind head on trunk.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/Elasticsearch/Product/CustomFieldUpdater.php	91.66%	4 Missing ⚠️
...uct/Subscriber/CustomFieldSearchableSubscriber.php	95.83%	1 Missing ⚠️
...archableForExistingCustomFieldsInProductSearch.php	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #13749      +/-   ##
==========================================
+ Coverage   54.41%   54.44%   +0.03%     
==========================================
  Files        3204     3207       +3     
  Lines       96436    96525      +89     
==========================================
+ Hits        52474    52552      +78     
- Misses      43962    43973      +11     

Flag	Coverage Δ
phpunit-migration	92.93% <94.73%> (+0.01%)	⬆️
phpunit-unit	52.13% <73.62%> (+0.01%)	⬆️

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[vienthuong]

Hey, could you provide some screenshots about your UI changes?

[tamvt]

Moved to this MR