pkg/envoy: use proto.Equal instead comparing strings
pkg/envoy: use proto.Equal instead comparing strings

On medium-large clusters with lots of endpoints, the conversion to
Strings in order to perform a comparison can be expensive. Instead,
we should make use of the protobuf equal function that should have
the same result.

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,cilium-team/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,cilium-team/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium