Fix: Only write enabled property when UserProvidedEnabled is true

Co-authored-by: Aniruddh25 <3513779+Aniruddh25@users.noreply.github.com>

Author: Copilot

src/Config/Converters/DatasourceHealthOptionsConvertorFactory.cs

@@ -121,8 +121,14 @@ public override void Write(Utf8JsonWriter writer, DatasourceHealthCheckConfig va
             if (value?.UserProvidedEnabled is true || value?.Name is not null || value?.UserProvidedThresholdMs is true)
             {
                 writer.WriteStartObject();
-                writer.WritePropertyName("enabled");
-                JsonSerializer.Serialize(writer, value.Enabled, options);
+                
+                // Only write enabled if it was explicitly provided by the user
+                if (value?.UserProvidedEnabled is true)
+                {
+                    writer.WritePropertyName("enabled");
+                    JsonSerializer.Serialize(writer, value.Enabled, options);
+                }
+                
                 if (value?.Name is not null)
                 {
                     writer.WritePropertyName("name");