Update debug code to not use Startup /2

Author: Rick-Anderson

aspnetcore/test/troubleshoot.md

@@ -85,85 +85,6 @@ To obtain the environment, use either of the following approaches:
 
 :::code language="csharp" source="~/test/troubleshoot/code/9.x/Program.cs" id="snippet1" highlight="13-85":::
 
-<!--
-```csharp
-if (app.Environment.IsDevelopment())
-{
-    app.Run(async (context) =>
-    {
-        var sb = new StringBuilder();
-        var nl = System.Environment.NewLine;
-        var rule = string.Concat(nl, new string('-', 40), nl);
-
-
-        var authSchemeProvider = app.Services.GetRequiredService<IAuthenticationSchemeProvider>();
-
-        sb.Append($"Request{rule}");
-        sb.Append($"{DateTimeOffset.Now}{nl}");
-        sb.Append($"{context.Request.Method} {context.Request.Path}{nl}");
-        sb.Append($"Scheme: {context.Request.Scheme}{nl}");
-        sb.Append($"Host: {context.Request.Headers["Host"]}{nl}");
-        sb.Append($"PathBase: {context.Request.PathBase.Value}{nl}");
-        sb.Append($"Path: {context.Request.Path.Value}{nl}");
-        sb.Append($"Query: {context.Request.QueryString.Value}{nl}{nl}");
-
-        sb.Append($"Connection{rule}");
-        sb.Append($"RemoteIp: {context.Connection.RemoteIpAddress}{nl}");
-        sb.Append($"RemotePort: {context.Connection.RemotePort}{nl}");
-        sb.Append($"LocalIp: {context.Connection.LocalIpAddress}{nl}");
-        sb.Append($"LocalPort: {context.Connection.LocalPort}{nl}");
-        sb.Append($"ClientCert: {context.Connection.ClientCertificate}{nl}{nl}");
-
-        sb.Append($"Identity{rule}");
-        sb.Append($"User: {context.User.Identity.Name}{nl}");
-        var scheme = await authSchemeProvider
-            .GetSchemeAsync(IISDefaults.AuthenticationScheme);
-        sb.Append($"DisplayName: {scheme?.DisplayName}{nl}{nl}");
-
-        sb.Append($"Headers{rule}");
-        foreach (var header in context.Request.Headers)
-        {
-            sb.Append($"{header.Key}: {header.Value}{nl}");
-        }
-        sb.Append(nl);
-
-        sb.Append($"WebSockets{rule}");
-        if (context.Features.Get<IHttpUpgradeFeature>() != null)
-        {
-            sb.Append($"Status: Enabled{nl}{nl}");
-        }
-        else
-        {
-            sb.Append($"Status: Disabled{nl}{nl}");
-        }
-
-        sb.Append($"Configuration{rule}");
-        var config = builder.Configuration;
-
-         foreach (var pair in config.AsEnumerable())
-        {
-            sb.Append($"{pair.Key}: {pair.Value}{nl}"); 
-        }
-        sb.Append(nl);
-        sb.Append(nl);
-
-        sb.Append($"Environment Variables{rule}");
-        var vars = System.Environment.GetEnvironmentVariables();
-        foreach (var key in vars.Keys.Cast<string>().OrderBy(key => key,
-            StringComparer.OrdinalIgnoreCase))
-        {
-            var value = vars[key];
-            sb.Append($"{key}: {value}{nl}");
-        }
-
-        context.Response.ContentType = "text/plain";
-        await context.Response.WriteAsync(sb.ToString());
-    });
-}
-```
---->
-
-
 ## Debug ASP.NET Core apps
 
 The following links provide information on debugging ASP.NET Core apps.