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

JobBuild
101503
04-27 01:45
e91d9d51
04-27 01:44
pull-kubernetes-bazel-build 1389625929751334912 1386858605512232960
pull-kubernetes-bazel-test 1389625929772306432 1386858605533204480
pull-kubernetes-dependencies 1389625929793277952 1386858605558370304
pull-kubernetes-e2e-gce-100-performance 1389625929734557696 1386858605495455744
pull-kubernetes-e2e-gce-ubuntu-containerd 1389625929684226048 1386858605428346880
pull-kubernetes-e2e-kind 1389672208493711360 1389625929847803904 1386858605608701952
pull-kubernetes-integration 1389625929814249472 1386858605579341824
pull-kubernetes-node-e2e 1389625929709391872 1386858605470289920
pull-kubernetes-typecheck 1389625929868775424 1386858605629673472
pull-kubernetes-verify 1389625929889746944 1386858605650644992