* upgrade wordpress/scripts to 22.3
* update jest config/setup
* add explicit-exports-references plugin
to handle payment-method-config.tsx spying on external methods
the way code is output now changed and tests like this would not
work anymore as transpilet files were no longer using exports but
local references to methods.
* missing snapshot
* make cart-products E2E test more stable
* surppress eslint error in test file
* fix css stylelint issues
* update eslint-plugin-woocommerce eslint package
* remove temp test:e2e:start script
* re-run
* add stylelint as recommended extension
* remove redundant types (provided by packages now)
* patch update @testing-library/jest-dom
* Use container queries to load Cart and Checkout responsive styles
* Update package-lock.json
* Make form-step react to container queries instead of media queries
* Make sidebar layout inner padding relative to the full-width
* Make container queries breakpoints smaller
* Add core breakpoint 480px, remove non-core breakpoints
* Add the optional operator & save callback
* Add the catOperator as a valid attribute
* Enable cat operator for Products by Category
* Add cat_operator support the products API endpoint
* Enable cat_operator in the shortcode and query utils
* Pluralize the “nothing found” string if we have multiple categories
* Fix style in the inspector panel
* Add category operator support to the Best Sellers product block
* Add cat_operator support to On Sale Products block
* Update label & margin
* Add travis to run JS & CSS linting, JS tests, and PHPUnit tests
* Move API initiation out of the gutenberg/files check
So that php tests run without having to build the JS files
* Add very basic product endpoint tests
* Fix stylelint issues in CSS
* Remove e2e setup, replace with dependency setup
* Add missing install step
* Remove cache for now
* Add specific `har-validator` dependency because v 5.1.2 has disappeared
* Only run npm install for the JS test job
* Check for installed plugins
* Update install location
* Fix typo in plugin name
* Check the BRANCH variable, rather than TRAVIS_PULL_REQUEST_BRANCH, which is only set on PR runs
* Remove debug command
* A change to trigger CI
* Set the expected node & npm versions
* Remove copy-pasted command, does not apply