refs https://github.com/TryGhost/Team/issues/586
On Ghost Boot, as part of configuring Stripe, this populates stripe products and prices for existing stripe customers in the newly created `stripe_prices` and `stripe_products` table, which allows us to map existing customers to default Ghost product and on current prices. The population script on boot is only run if we find -
- A Ghost Product
- No rows in `stripe_products`
- No rows in `stripe_prices`
- One or more rows in `members_stripe_customers_subscriptions`
