Responsible for populating the database with InitialData, i.e. non-product data such as countries, tax rates, shipping methods, payment methods & roles.
(data: InitialData, channel?: Channel) => Should be run before populating the products, so that there are TaxRates by which
product prices can be set. If the channel argument is set, then any ChannelAwareentities will be assigned to that Channel.
(data: InitialData, channel?: Channel) => Should be run after the products have been populated, otherwise the expected FacetValues will not yet exist.