V14: Migrate nucache to use System.Text.Json (#15685)

* Create system text serializer

* Assign property names with system text

* Use the new serializer

* Impement AutoInterningStringConverter with System.Text.Json

* Implement TextAutoInterningStringKeyCaseInsensitiveDictionaryConverter

* Make CaseInsensitiveDictionaryConverter

* Force datetimes to be read as UTC

* Remove usages of Newtonsoft.Json

* Remove text prefixes

* Remove unused Newtonsoft converter

* Remove more newtonsoft

* Remove duplicate implementation

* Rmove usage of missing class in tests

* Ignore null values

* Fix tests

* Remove Newtonstoft reference from NuCache

---------

Co-authored-by: Elitsa <elm@umbraco.dk>

src/Umbraco.PublishedCache.NuCache/DataSource/CultureVariation.cs

@@ -1,5 +1,6 @@
 using System.Runtime.Serialization;
-using Newtonsoft.Json;
+using System.Text.Json.Serialization;
+using Umbraco.Cms.Infrastructure.Serialization;
 
 namespace Umbraco.Cms.Infrastructure.PublishedCache.DataSource;
 
@@ -10,35 +11,37 @@ namespace Umbraco.Cms.Infrastructure.PublishedCache.DataSource;
 public class CultureVariation
 {
     [DataMember(Order = 0)]
-    [JsonProperty("nm")]
+    [JsonPropertyName("nm")]
     public string? Name { get; set; }
 
     [DataMember(Order = 1)]
-    [JsonProperty("us")]
+    [JsonPropertyName("us")]
     public string? UrlSegment { get; set; }
 
     [DataMember(Order = 2)]
-    [JsonProperty("dt")]
+    [JsonPropertyName("dt")]
+    [JsonConverter(typeof(ForceUtcDateTimeConverter))]
     public DateTime Date { get; set; }
 
     [DataMember(Order = 3)]
-    [JsonProperty("isd")]
+    [JsonPropertyName("isd")]
     public bool IsDraft { get; set; }
 
     // Legacy properties used to deserialize existing nucache db entries
     [IgnoreDataMember]
-    [JsonProperty("name")]
+    [JsonPropertyName("nam")]
     private string LegacyName { set => Name = value; }
 
     [IgnoreDataMember]
-    [JsonProperty("urlSegment")]
+    [JsonPropertyName("urlSegment")]
     private string LegacyUrlSegment { set => UrlSegment = value; }
 
     [IgnoreDataMember]
-    [JsonProperty("date")]
+    [JsonPropertyName("date")]
+    [JsonConverter(typeof(ForceUtcDateTimeConverter))]
     private DateTime LegacyDate { set => Date = value; }
 
     [IgnoreDataMember]
-    [JsonProperty("isDraft")]
+    [JsonPropertyName("isDraft")]
     private bool LegacyIsDraft { set => IsDraft = value; }
 }