Potential memory leak in packetparser's interfaceLockMap

[nddq]

Currently, packetparser generates an entry in the interfaceLockMap for each new interface that comes up. However, it fails to remove these entries when the interfaces go down. In environments with high pod counts and frequent churn, this can cause the map to grow indefinitely, resulting in a memory leak.

        ifaceKey := ifaceToKey(iface)
	lockMapVal, _ := p.interfaceLockMap.LoadOrStore(ifaceKey, &sync.Mutex{})
	mu := lockMapVal.(*sync.Mutex)
	mu.Lock()
	defer mu.Unlock()

	switch event.Type {
	case endpoint.EndpointCreated:
		p.l.Debug("Endpoint created", zap.String("name", iface.Name))
		p.createQdiscAndAttach(iface, Veth)
	case endpoint.EndpointDeleted:
		p.l.Debug("Endpoint deleted", zap.String("name", iface.Name))
		// Clean.
		if value, ok := p.tcMap.Load(ifaceKey); ok {
			v := value.(*tcValue)
			p.clean(v.tc, v.qdisc)
			// Delete from map.
			p.tcMap.Delete(ifaceKey)
		}
	default:
		// Unknown.
		p.l.Debug("Unknown event", zap.String("type", event.Type.String()))
	}