envoy: Disabling LuaPerRoute configuration doesn't work with envoy-v1.19.0

Title: Disabling LuaPerRoute configuration doesn’t work with envoy-v1.19.0

Description: Lua filter is executed for requests which match a route with Lua disabled using LuaPerRoute configuration. We are seeing this only in the latest envoy version - v1.19.0.

Repro steps:

1. Using the example from envoy doc, add a lua filter before the envoy.filters.http.router filter.

          - name: envoy.filters.http.lua
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
              inline_code: |
                function envoy_on_request(request_handle)
                  request_handle:logInfo("Hello World.")
                end
                function envoy_on_response(response_handle)
                  response_handle:logInfo("Goodbye")
                end

1. Create the following route in envoy.filters.network.http_connection_manager with lua filter disabled.

- match:
       prefix: "/healthcheck"
  direct_response:
       status: 200
  typed_per_filter_config:
     envoy.filters.http.lua:
        "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.LuaPerRoute
         disabled: true

1. Start Envoy

docker run -it -v $(pwd):/etc -p 10000:10000 -e ENVOY_UID=0 envoyproxy/envoy:v1.19.0 -c /etc/static.yaml

1. Make a request to /healthcheck.

curl -v  localhost:10000/healthcheck

< HTTP/1.1 200 OK
< date: Thu, 15 Jul 2021 14:35:12 GMT
< server: envoy
< content-length: 0

Expectation: Lua filter should not be executed

Actual logs:

[2021-07-15 14:30:45.627][23][debug][http] [source/common/http/conn_manager_impl.cc:858] [C0][S7712392761175078799] request headers complete (end_stream=true):
':authority', 'localhost:10000'
':path', '/healthcheck'
':method', 'GET'
'user-agent', 'curl/7.64.1'
'accept', '*/*'

[2021-07-15 14:30:45.627][23][info][lua] [source/extensions/filters/http/lua/lua_filter.cc:795] script log: Hello World.

[2021-07-15 14:30:45.628][23][debug][http] [source/common/http/filter_manager.cc:909] [C0][S7712392761175078799] Sending local reply with details direct_response

[2021-07-15 14:30:45.628][23][info][lua] [source/extensions/filters/http/lua/lua_filter.cc:795] script log: Goodbye

Config: static.yaml

Logs: trace logs