Duplicate PayPal captures and double stock reductions (5461)

[Dinamiko]

Two concurrent POST requests attempted to capture the same PayPal order. Different request IDs confirm two separate PHP contexts processed the same order simultaneously, resulting in duplicate PayPal transactions and double stock reduction.

Notes:

• Happens intermittently, difficult to reproduce.
• Likely race condition between webhook (CHECKOUT.ORDER.APPROVED) and return URL capture flow.

[github-actions]

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.3.0-pr3885-19668032241-gd29a8c5 (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.3.0-pr3885-19668032241-gd29a8c5
• Commit: d29a8c5
• Artifact: woocommerce-paypal-payments-3.3.0-pr3885-19668032241-gd29a8c5

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