Add comprehensive tests for checkout deduplication logic

[Copilot]

The checkout tracking deduplication logic in should_track_checkout() and mark_checkout_tracked() had no test coverage despite being critical for preventing duplicate product_checkout events.

Changes

• Core deduplication scenarios: Tests for first checkout, duplicate with same cart state, checkout after cart modification, and checkout with different/same JS session IDs
• Edge cases: Null session handling for both tracking methods
• Session state verification: Tests that mark_checkout_tracked() correctly stores tracking flag and session ID
• Test infrastructure: Helper methods set_session_cookie() and clear_session_cookie() to reduce duplication

All tests use reflection to access private methods and integrate with existing WC_Session mock infrastructure.

// Example: Testing session ID change triggers re-tracking
$session->set( Universal::CHECKOUT_TRACKED_KEY, true );
$session->set( Universal::CHECKOUT_SESSION_ID_KEY, 'old-session-id' );
$this->set_session_cookie( 'new-session-id' );

$result = $method->invoke( $universal, $session );
$this->assertTrue( $result ); // Different session ID → should track

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[jp-launch-control]

Code Coverage Summary

No summary data is available for parent commit 4ee5151, so cannot calculate coverage changes. 😴

If that commit is a feature branch rather than a trunk commit, this is expected. Otherwise, this should be updated once coverage for 4ee5151 is available.

Full summary · PHP report · JS report