Remove test entry from the cart response (6085)

[stracker-phil]

Description

The Cart API responses contained a test-object with details we used for debugging and testing.

To prepare the integration into the main develop branch, we're cleaning up this test code. It's not part of the schema that PayPal expects from the endpoint

[github-actions]

Test using WordPress Playground

The changes in this pull request can be previewed and tested using a WordPress Playground instance.
WordPress Playground is an experimental project that creates a full WordPress instance entirely within the browser.

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v4.0.2-pr4300-24897472480-gb65bec8 (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 4.0.2-pr4300-24897472480-gb65bec8
• Commit: d749cf5
• Artifact: woocommerce-paypal-payments-4.0.2-pr4300-24897472480-gb65bec8

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_{🤖 Auto-generated for commit d749cf5 • Last updated: 2026-04-24T15:29:16.249Z}

[danieldudzic]

👌

[Narek13]

Thanks for working on this. LGTM, although the PHPStan fails