[AC-1693] Send InvoiceUpcoming Notification to Client Owners (#3319)

* Add Organization_ReadOwnerEmailAddresses SPROC

* Add IOrganizationRepository.GetOwnerEmailAddressesById

* Add SendInvoiceUpcoming overload for multiple emails

* Update InvoiceUpcoming handler to send multiple emails

* Cy's feedback

* Updates from testing

Hardened against missing entity IDs in Stripe events in the StripeEventService. Updated ValidateCloudRegion to not use a refresh/expansion for the customer because the invoice.upcoming event does not have an invoice.Id. Updated the StripeController's handling of invoice.upcoming to not use a refresh/expansion for the subscription because the invoice does not have an ID.

* Fix broken test

src/Infrastructure.EntityFramework/Repositories/OrganizationRepository.cs

@@ -224,4 +224,24 @@ public class OrganizationRepository : Repository<Core.Entities.Organization, Org
             return selfHostedOrganization;
         }
     }
+
+    public async Task<IEnumerable<string>> GetOwnerEmailAddressesById(Guid organizationId)
+    {
+        using var scope = ServiceScopeFactory.CreateScope();
+
+        var dbContext = GetDatabaseContext(scope);
+
+        var query =
+            from u in dbContext.Users
+            join ou in dbContext.OrganizationUsers on u.Id equals ou.UserId
+            where
+                ou.OrganizationId == organizationId &&
+                ou.Type == OrganizationUserType.Owner &&
+                ou.Status == OrganizationUserStatusType.Confirmed
+            group u by u.Email
+            into grouped
+            select grouped.Key;
+
+        return await query.ToListAsync();
+    }
 }