fix: opa and envoy changes to support logging and hpa (#3126)

* fix: updated envoy logging and connections

* fix: changes to support hpa and test cases

* fix: updated envoy timeouts

* fix: updated envoy configs to workaround grpc limits

* fix: add option to enable decision logs in opa

* fix: remove pack_as_bytes to allow only UTF-8 contents

* fix: change back to google_grpc