feat(passport): add support for 'subscribed' marketing consent status

- Add Subscribed enum value to MarketingConsentStatus
- Add parsing for 'subscribed' status in PassportUI login flow
- Update ToApiString() method to handle 'subscribed' conversion

Ensures compatibility with Auth0 default marketing consent value

Author: rodrigo-fournier-immutable

src/Packages/Passport/Runtime/Scripts/Private/Model/MarketingConsentStatus.cs

@@ -9,6 +9,7 @@ namespace Immutable.Passport.Model
     public enum MarketingConsentStatus
     {
         OptedIn,
+        Subscribed,
         Unsubscribed
     }
 
@@ -27,6 +28,7 @@ public static string ToApiString(this MarketingConsentStatus status)
             return status switch
             {
                 MarketingConsentStatus.OptedIn => "opted_in",
+                MarketingConsentStatus.Subscribed => "subscribed",
                 MarketingConsentStatus.Unsubscribed => "unsubscribed",
                 _ => throw new ArgumentOutOfRangeException(nameof(status), status, "Unknown MarketingConsentStatus value")
             };

src/Packages/Passport/Runtime/Scripts/Public/PassportUI.cs

@@ -547,6 +547,9 @@ private async void HandleLoginData(string jsonData)
                         case "opted_in":
                             loginOptions.marketingConsentStatus = MarketingConsentStatus.OptedIn;
                             break;
+                        case "subscribed":
+                            loginOptions.marketingConsentStatus = MarketingConsentStatus.Subscribed;
+                            break;
                         case "unsubscribed":
                             loginOptions.marketingConsentStatus = MarketingConsentStatus.Unsubscribed;
                             break;