Remove duplicate params class, and fix up the existing one

Author: davidwengier

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/ProjectSystem/MonitorProjectConfigurationFilePathParams.cs

@@ -7,5 +7,5 @@ internal class MonitorProjectConfigurationFilePathParams
 {
     public required string ProjectKeyId { get; set; }
 
-    public required string ConfigurationFilePath { get; set; }
+    public required string? ConfigurationFilePath { get; set; }
 }

src/Razor/src/Microsoft.VisualStudio.LanguageServerClient.Razor/MonitorProjectConfigurationFilePathParams.cs

@@ -9,6 +9,7 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.LanguageServer;
 using Microsoft.AspNetCore.Razor.LanguageServer.Common;
+using Microsoft.AspNetCore.Razor.LanguageServer.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Telemetry;
 using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Razor;