Use reliable way to detect checkout page

[bor0]

We are seeing a bunch of warnings in WCCOM

2024-12-09T14:30:12.336938508Z PHP message: Warning: Attempt to read property "ID" on null in /var/www/wp-content/mu-plugins/jetpack-14.0/jetpack_vendor/automattic/woocommerce-analytics/src/class-universal.php on line 201 [woocommerce.com/wp-json/wc/store/cart] [wp-includes/class-wp-hook.php:324 Automattic\Woocommerce_Analytics\Universal->checkout_process(), wp-includes/class-wp-hook.php:348 WP_Hook->apply_filters(), wp-includes/plugin.php:517...

Proposed changes:

• Adds a more reliable way to check if we're on the checkout page, rather than potentially ending up with null post

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Jetpack product discussion

Does this pull request change what data or activity we track or use?

[github-actions]

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[bor0]

WooCommerce core uses the same approach

[opr]

Changes look good, thanks!

Should we update the checks here too:

jetpack/projects/packages/woocommerce-analytics/src/class-woo-analytics-trait.php

Lines 176 to 182 in 5315079

	if ( $cart_page && isset( $cart_page->post_content ) ) {
	$this->cart_content_source = $cart_page->post_content;
	}
	if ( $checkout_page && isset( $checkout_page->post_content ) ) {
	$this->checkout_content_source = $checkout_page->post_content;
	}