[dotnet] Removed {{separator}} token from C# filename codegen (#13237)

* Remove separator from codegen. This caused file names in the format of Accesibility{{separator}}AXPropertyName.cs for instance.

* Added {{separator}} replacement to Utility.cs ReplaceTokensInPath function.

Author: EdwinVanVliet

third_party/dotnet/devtools/src/generator/CodeGen/CodeGenerationDefinitionTemplateSettings.cs

@@ -1,4 +1,4 @@
-namespace OpenQA.Selenium.DevToolsGenerator.CodeGen
+namespace OpenQA.Selenium.DevToolsGenerator.CodeGen
 {
     using Newtonsoft.Json;
 

third_party/dotnet/devtools/src/generator/CodeGen/Utility.cs

@@ -26,6 +26,7 @@ public static string ReplaceTokensInPath(string path, string className, CodeGene
             path = path.Replace("{{templatePath}}", settings.TemplatesPath);
             path = path.Replace("{{domainName}}", context.Domain.Name);
             path = path.Replace('\\', System.IO.Path.DirectorySeparatorChar);
+            path = path.Replace("{{separator}}", System.IO.Path.DirectorySeparatorChar.ToString());
             return path;
         }