Delete the workaround for CodeLens tests failing

[jasonmalinowski]

We added these lines of code to work around the fact CodeLens had problems when we bumped our ServiceHub binaries to 9.0. We expect once we're on 17.14 Preview 3 images this should go away, so we should delete this.

roslyn/src/VisualStudio/IntegrationTest/TestSetup/TestExtensionErrorHandler.cs

Lines 25 to 29 in 32c1fcf

	if (exception.Message == "RemotePartyTerminated" && new System.Diagnostics.StackTrace().ToString().Contains("CodeLens") ||
	exception.Message == "Cannot access a disposed object.\r\nObject name: 'CodeLensHubClient'.")
	{
	return;
	}