SidecarScope.DependsOnConfig is not correct for DestinationRule #38082
Description
We do merge DRs for push context, so when sidecar scope AddConfigDependencies, we lost the some original configs info.
Then when a dr(merged into another dr) is updated, we could skip push xds to a proxy.
// Compute and send the new configuration for a connection.
func (s *DiscoveryServer) pushConnection(con *Connection, pushEv *Event) error {
pushRequest := pushEv.pushRequest
if pushRequest.Full {
// Update Proxy with current information.
s.updateProxy(con.proxy, pushRequest)
}
if !s.ProxyNeedsPush(con.proxy, pushRequest) {