[Helix] Enable Components.E2E tests

[HaoK]

Need to install selenium on helix machines?

 System.AggregateException : One or more errors occurred. (The selenium server instance did not start accepting requests at http://localhost:59102/wd/hub before the timeout occurred. The last exception was: System.AggregateException: One or more errors occurred. (Connection refused) ---> System.Net.Http.HttpRequestException: Connection refused ---> System.Net.Sockets.SocketException: Connection refused
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at System.Threading.Tasks.Task`1.get_Result()
   at Microsoft.AspNetCore.Components.E2ETest.Infrastructure.SeleniumStandaloneServer.PollUntilProcessStarted() in /_/src/Components/test/E2ETest/Infrastructure/SeleniumStandaloneServer.cs:line 77
---> (Inner Exception #0) System.Net.Http.HttpRequestException: Connection refused ---> System.Net.Sockets.SocketException: Connection refused
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)

[HaoK]

This also appears to be an issue with ProjectTemplates.Test

[mkArtakMSFT]

@HaoK is anybody tracking work to install selenium on the agents?

[mkArtakMSFT]

/cc @ryanbrandenburg

[HaoK]

There's the corresponding issue https://github.com/dotnet/core-eng/issues/5302

The templates/components tests are currently failing due to other issues, so they are waiting for us to confirm if the existing queues now has everything we need.

You can use #8256 to investigate the current project template helix failures, Components is blocked by the build issue #7862