[AC-358] Server changes for self host subscription page changes (#2826)

* [AC-358] Add constant for grace period length

* [AC-358] Add SubscriptionExpiration to OrganizationLicense.cs and increment Current_License_File_Version

* [AC-358] Update org subscription response model

- Add new SelfHostSubscriptionExpiration field that does not include a grace period
- Add optional License argument to constructor for self host responses
- Use the License, if available, to populate the expiration/subscription expiration fields
- Maintain backwards compatability by falling back to organization expiration date

* [AC-358] Read organization license file for self hosted subscription response

* [AC-358] Decrement current license file version and add comment documenting why

* [AC-358] Clarify name for new expiration without grace period field

src/Api/Models/Response/Organizations/OrganizationResponseModel.cs

@@ -3,6 +3,7 @@ using Bit.Core.Enums;
 using Bit.Core.Models.Api;
 using Bit.Core.Models.Business;
 using Bit.Core.Utilities;
+using Constants = Bit.Core.Constants;
 
 namespace Bit.Api.Models.Response.Organizations;
 
@@ -108,9 +109,32 @@ public class OrganizationSubscriptionResponseModel : OrganizationResponseModel
         }
     }
 
+    public OrganizationSubscriptionResponseModel(Organization organization, OrganizationLicense license) :
+        this(organization)
+    {
+        if (license != null)
+        {
+            // License expiration should always include grace period - See OrganizationLicense.cs
+            Expiration = license.Expires;
+            // Use license.ExpirationWithoutGracePeriod if available, otherwise assume license expiration minus grace period
+            ExpirationWithoutGracePeriod = license.ExpirationWithoutGracePeriod ??
+                                             license.Expires?.AddDays(-Constants
+                                                 .OrganizationSelfHostSubscriptionGracePeriodDays);
+        }
+    }
+
     public string StorageName { get; set; }
     public double? StorageGb { get; set; }
     public BillingSubscription Subscription { get; set; }
     public BillingSubscriptionUpcomingInvoice UpcomingInvoice { get; set; }
+
+    /// <summary>
+    /// Date when a self-hosted organization's subscription expires, without any grace period.
+    /// </summary>
+    public DateTime? ExpirationWithoutGracePeriod { get; set; }
+
+    /// <summary>
+    /// Date when a self-hosted organization expires (includes grace period).
+    /// </summary>
     public DateTime? Expiration { get; set; }
 }