[PM-25379] Refactor org metadata (#6441)

* ignore serena

* removing unused properties from org metadata

* removing further properties that can already be fetched on the client side using available data

* new vnext endpoint for org metadata plus caching metadata first pass

including new feature flag

# Conflicts:
#	src/Core/Constants.cs

* [PM-25379] decided against cache and new query shouldn't use the service

* pr feedback

removing unneeded response model

* run dotnet format

src/Core/Billing/Organizations/Queries/GetOrganizationMetadataQuery.cs

@@ -0,0 +1,95 @@
+using Bit.Core.AdminConsole.Entities;
+using Bit.Core.Billing.Constants;
+using Bit.Core.Billing.Organizations.Models;
+using Bit.Core.Billing.Pricing;
+using Bit.Core.Billing.Services;
+using Bit.Core.Repositories;
+using Bit.Core.Settings;
+using Stripe;
+
+namespace Bit.Core.Billing.Organizations.Queries;
+
+public interface IGetOrganizationMetadataQuery
+{
+    Task<OrganizationMetadata?> Run(Organization organization);
+}
+
+public class GetOrganizationMetadataQuery(
+    IGlobalSettings globalSettings,
+    IOrganizationRepository organizationRepository,
+    IPricingClient pricingClient,
+    ISubscriberService subscriberService) : IGetOrganizationMetadataQuery
+{
+    public async Task<OrganizationMetadata?> Run(Organization organization)
+    {
+        if (organization == null)
+        {
+            return null;
+        }
+
+        if (globalSettings.SelfHosted)
+        {
+            return OrganizationMetadata.Default;
+        }
+
+        var orgOccupiedSeats = await organizationRepository.GetOccupiedSeatCountByOrganizationIdAsync(organization.Id);
+
+        if (string.IsNullOrWhiteSpace(organization.GatewaySubscriptionId))
+        {
+            return OrganizationMetadata.Default with
+            {
+                OrganizationOccupiedSeats = orgOccupiedSeats.Total
+            };
+        }
+
+        var customer = await subscriberService.GetCustomer(organization,
+            new CustomerGetOptions { Expand = ["discount.coupon.applies_to"] });
+
+        var subscription = await subscriberService.GetSubscription(organization);
+
+        if (customer == null || subscription == null)
+        {
+            return OrganizationMetadata.Default with
+            {
+                OrganizationOccupiedSeats = orgOccupiedSeats.Total
+            };
+        }
+
+        var isOnSecretsManagerStandalone = await IsOnSecretsManagerStandalone(organization, customer, subscription);
+
+        return new OrganizationMetadata(
+            isOnSecretsManagerStandalone,
+            orgOccupiedSeats.Total);
+    }
+
+    private async Task<bool> IsOnSecretsManagerStandalone(
+        Organization organization,
+        Customer? customer,
+        Subscription? subscription)
+    {
+        if (customer == null || subscription == null)
+        {
+            return false;
+        }
+
+        var plan = await pricingClient.GetPlanOrThrow(organization.PlanType);
+
+        if (!plan.SupportsSecretsManager)
+        {
+            return false;
+        }
+
+        var hasCoupon = customer.Discount?.Coupon?.Id == StripeConstants.CouponIDs.SecretsManagerStandalone;
+
+        if (!hasCoupon)
+        {
+            return false;
+        }
+
+        var subscriptionProductIds = subscription.Items.Data.Select(item => item.Plan.ProductId);
+
+        var couponAppliesTo = customer.Discount?.Coupon?.AppliesTo?.Products;
+
+        return subscriptionProductIds.Intersect(couponAppliesTo ?? []).Any();
+    }
+}