Infinite loop while trying to change payment method for subscription (5900)

[Dinamiko]

When accessing the Change Payment Method page for a subscription (via My Account > Subscriptions), an infinite loop is triggered, causing a crash or white screen.

Steps to reproduce

• create a page with classic checkout shortcode
• Set it as Checkout page in WC advanced settings
• Purchase a subscription and try to change payment from My Account / Subscriptions / Subscription / Change payment button

PR Changes

get_the_content() internally calls the_title_attribute(), which applies the the_title filter. When WooCommerce Subscriptions hooks that filter and calls is_checkout(), it triggers our woocommerce_is_checkout handler, which calls back into find_classic_shortcode_block() creating infinite recursion.

This PR uses get_post()->post_content bypassing all filters, which is safe here since we only need the raw block markup.

[github-actions]

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.4.0-pr4085-21949364542-g4c34344 (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.4.0-pr4085-21949364542-g4c34344
• Commit: 4c34344
• Artifact: woocommerce-paypal-payments-3.4.0-pr4085-21949364542-g4c34344

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