[Backport to release/10.7] [WOOPLUG-6477] fix: fix _load_textdomain_just_in_time warning in FulfillmentsController::register_data_stores

[woocommercebot]

This PR is a cherry-pick of #63888 to release/10.7.

Original PR Description

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• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Fixes _load_textdomain_just_in_time warning triggered when FulfillmentsController::register_data_stores() calls FeaturesController::feature_is_enabled() before the init action fires.

When plugins like WC Payments call WC_Data_Store::load() during plugins_loaded, the woocommerce_data_stores filter fires, and feature_is_enabled() triggers init_feature_definitions() which uses __() for translations. This causes WordPress to warn about loading textdomains too early.

The fix checks the option directly with get_option() instead of going through FeaturesController::feature_is_enabled(), matching the established pattern in OrdersVersionStringInvalidator, TaxRateVersionStringInvalidator, and ProductVersionStringInvalidator.

Related issue: WOOPLUG-6477

Screenshots or screen recordings:

Before	After

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Install and activate WooCommerce Payments plugin (or any plugin that calls WC_Data_Store::load() during plugins_loaded)
2. Enable the fulfillments feature flag
3. Enable WP_DEBUG and WP_DEBUG_LOG
4. Load any admin page
5. Check wp-content/debug.log for _load_textdomain_just_in_time warnings related to the woocommerce textdomain
6. Verify no such warning appears after the fix

Testing that has already taken place:

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Changelog Entry Details

Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

Message

Fix _load_textdomain_just_in_time warning in FulfillmentsController by checking feature option directly instead of using FeaturesController::feature_is_enabled() before init action.

Changelog Entry Comment

Comment

[github-actions]

Testing Guidelines

Hi @tpaksu ,

Apart from reviewing the code changes, please make sure to review the testing instructions (Guide) and verify that relevant tests (E2E, Unit, Integration, etc.) have been added or updated as needed.

Reminder: PR reviewers are required to document testing performed. This includes:

• 🖼️ Screenshots or screen recordings.
• 📝 List of functionality tested / steps followed.
• 🌐 Site details (environment attributes such as hosting type, plugins, theme, store size, store age, and relevant settings).
• 🔍 Any analysis performed, such as assessing potential impacts on environment attributes and other plugins, conducting performance profiling, or using LLM/AI-based analysis.

⚠️ Within the testing details you provide, please ensure that no sensitive information (such as API keys, passwords, user data, etc.) is included in this public issue.

[github-actions]

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