Prevent webhook resubscribe on upgrade from 3.0.0+

[AlexP11223]

Prevent webhook resubscribe when upgrading from 3.0.0 or later.

[github-actions]

Test using WordPress Playground

The changes in this pull request can be previewed and tested using a WordPress Playground instance.
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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.3.1-pr3917-19964195168-g74c451b (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.3.1-pr3917-19964195168-g74c451b
• Commit: 74c451b
• Artifact: woocommerce-paypal-payments-3.3.1-pr3917-19964195168-g74c451b

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_{🤖 Auto-generated for commit 74c451b • Last updated: 2025-12-05T13:28:54.400Z}