C#: Add proper .NET environemtn variables.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DotNet.cs

@@ -190,6 +190,13 @@ private static BuildScript DownloadDotNet(IBuildActions actions, ILogger logger,
             return BuildScript.Failure;
         }
 
+        private static readonly Dictionary<string, string> dotnetEnvironment = new()
+        {
+            {"DOTNET_CLI_UI_LANGUAGE", "en"},
+            {"MSBUILDDISABLENODEREUSE", "1"},
+            {"DOTNET_SKIP_FIRST_TIME_EXPERIENCE", "true"}
+        };
+
         /// <summary>
         /// Returns a script for downloading specific .NET SDK versions, if the
         /// versions are not already installed.
@@ -289,7 +296,7 @@ BuildScript GetInstall(string pwsh) =>
                     };
                 }
 
-                var dotnetInfo = new CommandBuilder(actions).
+                var dotnetInfo = new CommandBuilder(actions, environment: dotnetEnvironment).
                     RunCommand(actions.PathCombine(path, "dotnet")).
                     Argument("--info").Script;
 
@@ -321,7 +328,7 @@ BuildScript GetInstall(string pwsh) =>
 
         private static BuildScript GetInstalledSdksScript(IBuildActions actions)
         {
-            var listSdks = new CommandBuilder(actions, silent: true).
+            var listSdks = new CommandBuilder(actions, silent: true, environment: dotnetEnvironment).
                 RunCommand("dotnet").
                 Argument("--list-sdks");
             return listSdks.Script;