WooCommerce Composite Products 9.0.3

* Fix - Added missing JS method 'Composite_Availability_View::get_components_availability_string'.
* Fix - Prevent JS errors if third-party code has already started the Backbone history.
* Fix - Renamed summary element button text from 'View' to 'Edit' when the chosen product is configurable.
* Tweak - Detect scroll anchoring support and let the browser handle things when available.
* Tweak - Prevent autotransitioning if the selected product is out of stock.
* Tweak - Consider if customer is tax exempt when formatting cart item display prices.

* Fix - 'Sold Individually > Yes' not working as expected.
* Tweak - Added loopback test results in Status Report.

* Feature - Check if the server is able to perform loopback requests and display a warning if the test fails.
* Tweak - Display warning if PHP is truncating form fields on edit-post pages when updating a Composite Product.
* Fix - Updated the datastore logic of Composite Products to update the 'tax_status' and 'tax_class' product lookup table columns.