Support override_stream_error_on_invalid_http_message

[guydc]

Description: Envoy Docs:

if you run level two Envoy version 1.11.1 or greater which terminates HTTP/2 or above, we strongly advise you to change the HttpConnectionManager configuration of your level two Envoy, by setting its downstream validation of HTTP messaging option to true

Envoy Gateway should support configuration of this setting, so that users can adjust it, based on their deployment mode (L1 or L2) and protocol versions in use.

Relevant Links: https://www.envoyproxy.io/docs/envoy/latest/configuration/best_practices/level_two

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[shawnh2]

closed in favor of #3682