Bug: fix deprecation warning 'envoy.config.route.v3.WeightedCluster.total_weight' from file route_components.proto

[tnsardesai]

Summary
What are you observing that doesn't seem right?
Seeing deprecation following warning

[2023-08-04 19:40:58.318][22][warning][misc] [source/common/protobuf/message_validator_impl.cc:21] Deprecated field: type envoy.config.route.v3.WeightedCluster Using deprecated option 'envoy.config.route.v3.WeightedCluster.total_weight' from file route_components.proto. This configuration will be removed from Envoy soon. Please see https://www.envoyproxy.io/docs/envoy/latest/version_history/version_history for details. If continued use of this field is absolutely necessary, see https://www.envoyproxy.io/docs/envoy/latest/configuration/operations/runtime#using-runtime-overrides-for-deprecated-features for how to apply a temporary and highly discouraged override.

Steps to Reproduce
What are the steps you can take to reproduce this issue?
Use weighted routes

Are you currently working around this issue?
How are you currently solving this problem?
Ignoring the logs

Additional context
Anything else we should know?
Envoy docs https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/route/v3/route_components.proto#config-route-v3-weightedcluster - This field is now deprecated, and the client will use the sum of all cluster weights. It is up to the management server to supply the correct weights.

Deprecation warning shows with envoy public.ecr.aws/appmesh/aws-appmesh-envoy:v1.24.0.0-prod. I haven't tried it with latest. Btw #438 this other deprecation warning is still there.

[dhilgarth]

I can confirm that this also happens with 1.27.2.0