Remove support for old x-ms headers based correlation. #939

AspNetCore SDK 2.1.0 version onwards, x-ms ids are not used. It was replaced with request-id based correlation. However, x-ms headers were still parsed from incoming headers to support with very old systems.

Proposing to completely remove x-ms headers based correlation. This would have small performance gain, as we don't need to search for x-ms headers anymore in the incoming request, and also would keep code base less complicated.