JornShen: cherry pick of #100913: no watch endpointslice in userpace mode

JobBuild
101502
04-27 01:43
17aa39a6
04-27 01:42
pull-kubernetes-bazel-build 1389624921843306496 1386858234081447936
pull-kubernetes-bazel-test 1389624921868472320 1386858234102419456
pull-kubernetes-dependencies 1389624921893638144 1386858234127585280
pull-kubernetes-e2e-gce-100-performance 1389624921822334976 1386858234064670720
pull-kubernetes-e2e-gce-ubuntu-containerd 1389624921746837504 1386858234018533376
pull-kubernetes-e2e-kind 1389624921948164096 1386858234173722624
pull-kubernetes-integration 1389624921918803968 1386858234144362496
pull-kubernetes-node-e2e 1389624921767809024 1386858234039504896
pull-kubernetes-typecheck 1389624921969135616 1386858234194694144
pull-kubernetes-verify 1389624921998495744 1386858234215665664