Fix redis-cli cluster add-node race in cli.tcl (#11349)
There is a race condition in the test: ``` *** [err]: redis-cli --cluster add-node with cluster-port in tests/unit/cluster/cli.tcl Expected '5' to be equal to '4' {assert_equal 5 [CI 0 cluster_known_nodes]} proc ::test) ``` When using cli to add node, there can potentially be a race condition in which all nodes presenting cluster state o.k even though the added node did not yet meet all cluster nodes. This comment and the fix were taken from #11221. Also apply it in several other similar places.
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