Remove hard coded user-agent From AzureDevOpsEndpoint (#1785)

For some reason, we have the User Agent hard coded on
`AzureDevOpsEndpoint`. No idea why, but it looks like the version that's
coded is no longer supported.

This comments out that line to hopefully resolve the issue some users
are facing of `BrowserNotSupportedException`.


#1783

This closes #1784 1784

src/MigrationTools.Clients.AzureDevops.Rest/Endpoints/AzureDevOpsEndpoint.cs

@@ -98,8 +98,7 @@ private HttpClient CreateHttpClientWithHeaders(string url, string versionParamet
  };
  client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(string.Format("{0}:{1}", "", Options.AccessToken))));
  client.DefaultRequestHeaders.Add("Accept", $"application/json; {versionParameter}");
- client.DefaultRequestHeaders.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
-
+ //client.DefaultRequestHeaders.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)"); #1784
  return client;
  }