area/xdsbughelp wanted
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描述
Title: in grpc_mux_impl, let's reject a resonse when we see duplicate resources.
Description: see https://github.com/envoyproxy/envoy/blob/main/source/common/config/grpc_mux_impl.cc#L224 We want to not "dedup" but reject the response here when the emplace fails
new_grpc_mux_impl seems doesnt have same issue as it push dup resources to each xds impl, where the dup resources gets rejected.
Repro steps:
send a discoveryResponse with multiple resources with the same name. Envoy accepts it silently.