Make client list function use the traffic-managers WatchWorkloads

Let the `telepresence list` command use a workload collection that is
backed by the traffic-managers `WatchWorkloads` function.

The client will use local shared informers to watch the workloads when
connecting to an older traffic-manager that doesn't support the
`WatchWorkloads` call.

Signed-off-by: Thomas Hallgren <thomas@tada.se>

pkg/client/userd/trafficmgr/intercept.go

@@ -503,7 +503,6 @@ func (s *session) ensureNoInterceptConflict(ir *rpc.CreateInterceptRequest) *rpc
 // only if the returned rpc.InterceptResult is nil. The returned runtime.Object is either nil, indicating a local
 // intercept, or the workload for the intercept.
 func (s *session) CanIntercept(c context.Context, ir *rpc.CreateInterceptRequest) (userd.InterceptInfo, *rpc.InterceptResult) {
-	s.waitForSync(c)
 	spec := ir.Spec
 	if spec.Namespace == "" {
 		spec.Namespace = s.Namespace