Add tests for GameVersionConverter and fix edge case (#1726)

- Adds tests for GameVersionConverter
- Refactors GameVersionConverter to reduce nesting
- Fixes an edge case in GameVersion deserialization in which the JsonConstructor will be invoked even if no properties match
- Adds a test for the GameVersion deserialization edge case

Dalamud.Test/Game/GameVersionTests.cs

@@ -225,6 +225,17 @@ namespace Dalamud.Test.Game
             Assert.Throws<ArgumentOutOfRangeException>(() => JsonConvert.DeserializeObject<GameVersion>(serialized));
         }
 
+        [Fact]
+        public void VersionInvalidTypeDeserialization()
+        {
+            var serialized = """
+                             {
+                                "Value": "Hello"
+                             }
+                             """;
+            Assert.Throws<JsonSerializationException>(() => JsonConvert.DeserializeObject<GameVersion>(serialized));
+        }
+
         [Fact]
         public void VersionConstructorNegativeYear()
         {