Ext_proc: support RouteCacheAction in the filter config (#33830)

This PR is a follow up change for: #33582.

It is to support RouteCacheAction to force clearing the route cache in ext_proc filter even side stream server does not send the clear_route_cache in the response.

Signed-off-by: Yanjun Xiang <yanjunxiang@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ a7d3789c3eeda314c6a96be72485eb89a672a268

envoy/extensions/filters/http/ext_proc/v3/ext_proc.proto

@@ -250,7 +250,6 @@ message ExternalProcessor {
   bool disable_clear_route_cache = 11
       [(udpa.annotations.field_migrate).oneof_promotion = "clear_route_cache_type"];
 
-  // [#not-implemented-hide:]
   // Specifies the action to be taken when an external processor response is
   // received in response to request headers. It is recommended to set this field than set
   // :ref:`disable_clear_route_cache <envoy_v3_api_field_extensions.filters.http.ext_proc.v3.ExternalProcessor.disable_clear_route_cache>`.