config: removing deprecated Listener 'type' field (#5146 An error occurred )

Risk Level: Medium (if folks are using long-deprecated configs)
Testing: fixed up tests
Docs Changes: n/a
Release Notes: none

Signed-off-by: Alyssa Wilk <alyssar@chromium.org>

Mirrored from https://github.com/envoyproxy/envoy @ 892168c1dbbc7e6f7b94181b5cb29150667e81e6

envoy/api/v2/listener/listener.proto

@@ -42,13 +42,6 @@ message Filter {
     // [#not-implemented-hide:]
     google.protobuf.Any typed_config = 4;
   }
-  // [#not-implemented-hide:]
-  message DeprecatedV1 {
-    string type = 1;
-  }
-
-  // [#not-implemented-hide:]
-  DeprecatedV1 deprecated_v1 = 3 [deprecated = true];
 }
 
 // Specifies the match criteria for selecting a specific filter chain for a