fix(wcs): migrate-expired-subscriptions handle manual subscriptions

[chickenn00dle]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This PR adds support for manual subscriptions to the migrate-expired-subscriptions cli tool.

How to test the changes in this Pull Request:

• Ensure you have a manual subscription that is on-hold because it has reached it's next payment date.
• Make sure the next payment date is within whatever you have set as the on-hold duration in WooCommerce > Settings > Subscriptions > Newspack Subscriptions Settings. If you need to, you can adjust this via wp shell:

$s = wcs_get_subscription(12345);
$s->update_dates(['next_payment' => "2025-01-09 20:51:28"]);

• Run the wp newspack migrate-expired-subscriptions --verbose --ids=12345 command.
• Verify the output indicates the subscription is within the on-hold duration
• Now run the command with the --live flag
• Verify the subscription status has NOT changed in wp-admin
• Either test another manual subscription with a next payment date that is beyond the on-hold duration, or use wp shell to manually adjust the next payment date
• Repeat the command without the --live flag and verify the output says the status is updated to expired
• Repeat with the --live flag and verify the subscription status has actually changed in wp-admin

BONUS: If you have any subscriptions that are still around from before this feature was launched that are on-hold, and have retries, smoke test the command with these as well.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?