Mapped Stripe Product name to Product name

closes https://github.com/TryGhost/Team/issues/682

This ensures that the Stripe Product name is updated during the
migrations of an existing site and any future updates to the Product
name.

ghost/members-api/lib/migrations/index.js

@@ -127,11 +127,11 @@ module.exports = class StripeMigrations {
 
         if (!defaultStripeProduct) {
             this._logging.info('Could not find Stripe Product - creating one');
-            const stripeProduct = await this._stripeAPIService.createProduct({
-                name: 'Ghost Product'
-            });
             const productsPage = await this._Product.findPage({limit: 1});
             const defaultProduct = productsPage.data[0];
+            const stripeProduct = await this._stripeAPIService.createProduct({
+                name: defaultProduct.get('name')
+            });
             if (!defaultProduct) {
                 this._logging.error('Could not find Product - skipping stripe_plans -> stripe_prices migration');
                 return;

ghost/members-api/lib/repositories/product/index.js

@@ -176,7 +176,7 @@ class ProductRepository {
 
             if (!product.related('stripeProducts').first()) {
                 const stripeProduct = await this._stripeAPIService.createProduct({
-                    name: productData.name
+                    name: product.get('name')
                 });
 
                 await this._StripeProduct.add({
@@ -185,6 +185,13 @@ class ProductRepository {
                 }, options);
 
                 await product.related('stripeProducts').fetch(options);
+            } else {
+                if (product.attributes.name !== product._previousAttributes.name) {
+                    const stripeProduct = product.related('stripeProducts').first();
+                    await this._stripeAPIService.updateProduct(stripeProduct.get('stripe_product_id'), {
+                        name: product.get('name')
+                    });
+                }
             }
 
             const defaultStripeProduct = product.related('stripeProducts').first();

ghost/members-api/lib/services/stripe-api/index.js

@@ -136,6 +136,22 @@ module.exports = class StripeAPIService {
         return price;
     }
 
+    /**
+     * @param {string} id
+     * @param {object} options
+     * @param {string} options.name
+     *
+     * @returns {Promise<IProduct>}
+     */
+    async updateProduct(id, options) {
+        await this._rateLimitBucket.throttle();
+        const product = await this._stripe.products.update(id, {
+            name: options.name
+        });
+
+        return product;
+    }
+
     /**
      * ensureProduct.
      *