chore: Remove ReadAt (#528)

Some old ReadAts left behind

Author: oskogstad

src/Digdir.Domain.Dialogporten.Application/Features/V1/EndUser/Dialogs/Queries/Get/GetDialogDto.cs

@@ -23,7 +23,6 @@ public sealed class GetDialogDto
     public DateTimeOffset? ExpiresAt { get; set; }
     public DateTimeOffset CreatedAt { get; set; }
     public DateTimeOffset UpdatedAt { get; set; }
-    public DateTimeOffset? ReadAt { get; set; }
 
     public DialogStatus.Values Status { get; set; }
 

src/Digdir.Domain.Dialogporten.Application/Features/V1/EndUser/Dialogs/Queries/Get/GetDialogQuery.cs

@@ -103,8 +103,8 @@ public async Task<GetDialogResult> Handle(GetDialogQuery request, CancellationTo
 
         saveResult.Switch(
             success => { },
-            domainError => throw new UnreachableException("Should not get domain error when updating ReadAt."),
-            concurrencyError => throw new UnreachableException("Should not get concurrencyError when updating ReadAt."));
+            domainError => throw new UnreachableException("Should not get domain error when updating SeenAt."),
+            concurrencyError => throw new UnreachableException("Should not get concurrencyError when updating SeenAt."));
 
         // hash end user ids
         var salt = MappingUtils.GetHashSalt();

src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Queries/Get/GetDialogDto.cs

@@ -24,7 +24,6 @@ public sealed class GetDialogDto
     public DateTimeOffset? ExpiresAt { get; set; }
     public DateTimeOffset CreatedAt { get; set; }
     public DateTimeOffset UpdatedAt { get; set; }
-    public DateTimeOffset? ReadAt { get; set; }
 
     public DialogStatus.Values Status { get; set; }