[AC-2447] Update PutCollection to return Unavailable cipher when last Can Manage Access is Removed (#4074)

* update CiphersController to return a unavailable value to the client so it can determine if the user removed the final Can Manage access of an item

src/Api/Vault/Models/Response/OptionalCipherDetailsResponseModel.cs

@@ -0,0 +1,13 @@
+using Bit.Api.Vault.Models.Response;
+using Bit.Core.Models.Api;
+
+public class OptionalCipherDetailsResponseModel : ResponseModel
+{
+    public bool Unavailable { get; set; }
+
+    public CipherDetailsResponseModel? Cipher { get; set; }
+
+    public OptionalCipherDetailsResponseModel()
+        : base("optionalCipherDetails")
+    { }
+}