Fix legacy document transformation (#5315)

* Remove unused property from legacy document transformation
Resolves #5303

* Do not overwrite legacy documents with transformations
Resolves #1886

Author: copyleftproducts

src/NSwag.Commands/NSwagDocumentBase.cs

@@ -167,14 +167,7 @@ protected static async Task<TDocument> LoadAsync<TDocument>(
             where TDocument : NSwagDocumentBase, new()
         {
             var data = File.ReadAllText(filePath);
-            data = TransformLegacyDocument(data, out var requiredLegacyTransformations);
-
-            if (requiredLegacyTransformations)
-            {
-                // Save now to avoid transformations
-                var document = LoadDocument<TDocument>(filePath, data);
-                await document.SaveAsync();
-            }
+            data = TransformLegacyDocument(data, out var _);
 
             if (applyTransformations)
             {
@@ -513,12 +506,6 @@ private static string TransformLegacyDocument(string data, out bool saveFile)
                 saveFile = true;
             }
 
-            if (data.Contains("\"noBuild\":") && !data.Contains("RequireParametersWithoutDefault", StringComparison.OrdinalIgnoreCase))
-            {
-                data = data.Replace("\"noBuild\":", "\"requireParametersWithoutDefault\": true, \"noBuild\":");
-                saveFile = true;
-            }
-
             if (data.Contains("assemblyTypeToSwagger"))
             {
                 data = data.Replace("assemblyTypeToSwagger", "typesToSwagger");