Description:

Describe the desired behavior, what scenario it enables and how it
would be used.

Envoy Gateway disabled leader election at default and didn`t expose it through envoy gateway config. When scaling cp replicas, Multiple EG will be writing status back for same resource.

We need to find out which is more expensive - enabling leader election and EG sending heartbeats to API server or multiple EG writing status back for same resource.

cc @envoyproxy/gateway-maintainers

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