Added custom prices list to portal settings (#12912)

refs https://github.com/TryGhost/Team/issues/637

With custom prices, Portal now needs to show all available custom prices in the UI instead of just `monthly` and `yearly` prices. This change adds a list of all custom prices to Portal site settings for the default product which Portal will use to show the available prices in UI. 
Note: As part of cleanup, the stripe price ids will be removed from the prices list.

Also:
- Fixes product name in serialised subscriptions
- Adds `type` value in  serialised price object

core/server/models/stripe-customer-subscription.js

@@ -43,13 +43,15 @@ const StripeCustomerSubscription = ghostBookshelf.Model.extend({
                 nickname: defaultSerializedObject.stripePrice.nickname,
                 amount: defaultSerializedObject.stripePrice.amount,
                 interval: defaultSerializedObject.stripePrice.interval,
+                type: defaultSerializedObject.stripePrice.type,
                 currency: String.prototype.toUpperCase.call(defaultSerializedObject.stripePrice.currency)
             };
 
             if (defaultSerializedObject.stripePrice.stripeProduct) {
+                const productData = defaultSerializedObject.stripePrice.stripeProduct.product || {};
                 serialized.price.product = {
                     id: defaultSerializedObject.stripePrice.stripeProduct.stripe_product_id,
-                    name: defaultSerializedObject.stripePrice.stripeProduct.name,
+                    name: productData.name,
                     product_id: defaultSerializedObject.stripePrice.stripeProduct.product_id
                 };
             }

core/server/services/members/middleware.js

@@ -77,6 +77,19 @@ const updateMemberData = async function (req, res) {
     }
 };
 
+const getDefaultProductPrices = async function () {
+    const page = await membersService.api.productRepository.list({
+        limit: 1
+    });
+    const [product] = page.data;
+    if (product) {
+        const model = await membersService.api.productRepository.get({id: product.get('id')}, {withRelated: ['stripePrices']});
+        const productData = model.toJSON();
+        return productData.stripePrices || [];
+    }
+    return [];
+};
+
 const getMemberSiteData = async function (req, res) {
     const isStripeConfigured = membersService.config.isStripeConnected();
     const domain = urlUtils.urlFor('home', true).match(new RegExp('^https?://([^/:?#]+)(?:[/:?#]|$)', 'i'));
@@ -86,6 +99,7 @@ const getMemberSiteData = async function (req, res) {
     if (!supportAddress.includes('@')) {
         supportAddress = `${supportAddress}@${blogDomain}`;
     }
+    const defaultPrices = await getDefaultProductPrices();
     const response = {
         title: settingsCache.get('title'),
         description: settingsCache.get('description'),
@@ -95,6 +109,7 @@ const getMemberSiteData = async function (req, res) {
         url: urlUtils.urlFor('home', true),
         version: ghostVersion.safe,
         plans: membersService.config.getPublicPlans(),
+        prices: defaultPrices,
         allow_self_signup: membersService.config.getAllowSelfSignup(),
         members_signup_access: settingsCache.get('members_signup_access'),
         is_stripe_configured: isStripeConfigured,