Remove redundant cache from ReferenceTransactionStatus (6280)

[danieldudzic]

Description

Remove the redundant cache from ReferenceTransactionStatus and rely on PartnersEndpoint::seller_status(), which already caches the SellerStatus object.

This cache is a leftover from the old BillingAgreementsEndpoint (removed in #3495), where it made sense because the check required an expensive create_token() API call.

Now that the class reads from PartnersEndpoint::seller_status(), which already caches the SellerStatus object in its own transient, the extra cache is redundant.

This change:

• Removes the extra boolean cache and its service wiring
• Keeps woocommerce_paypal_payments_seller_status effective on repeated calls
• Removes the stale cache-clearing logic from WCGatewayModule
• Adds unit coverage for the updated helper behavior

[github-actions]

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v4.0.2-pr4309-25054092804-g7a94faf (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 4.0.2-pr4309-25054092804-g7a94faf
• Commit: 6441670
• Artifact: woocommerce-paypal-payments-4.0.2-pr4309-25054092804-g7a94faf

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_{🤖 Auto-generated for commit 6441670 • Last updated: 2026-04-28T13:00:00.894Z}

[Narek13]

LGTM 👍 Thanks a lot for adding the unit test!