Add k8s join and disjoin test cases (#16141)#16330

yxieca merged 3 commits intosonic-net:202311sonic-net/sonic-mgmt:202311from

lixiaoyuner:dev/yunli1/202311-cherry-pick-k8s-join-caselixiaoyuner/sonic-mgmt:dev/yunli1/202311-cherry-pick-k8s-join-caseCopy head branch name to clipboard