fix: insufficient error handling for cluster down #971

Job	Run time
IPS	3m 2s
Lint	14s
Benchmark	2m 39s
Main (7.2, 3.3)	1m 14s
Main (7.2, 3.3, compose.ssl.yaml)	1m 24s
Massive Cluster	4m 55s
Main (7.2, 3.3, hiredis)	1m 11s
NAT-ted Environments	3m 0s
Profiling (single)	55s
Main (7.2, 3.3, hiredis, compose.ssl.yaml)	1m 39s
Profiling (excessive_pipelining)	52s
Main (7.2, 3.3, compose.replica.yaml, 2)	1m 5s
Profiling (pipelining_in_moderation)	51s
Main (test_cluster_state, PrimaryOnly, compose.valkey.yaml, 8, 2, 9)	2m 49s
Profiling (original_mget)	51s
Main (test_cluster_state, Pooled, compose.valkey.yaml, 8, 2, 9)	2m 52s
Profiling (emulated_mget)	1m 1s
Main (test_cluster_state, ScaleReadRandom, compose.valkey.yaml, 8, 2, 9)	2m 51s
Main (test_cluster_state, ScaleReadRandomWithPrimary, compose.valkey.yaml, 8, 2, 9)	2m 50s
Main (test_cluster_state, ScaleReadLatency, compose.valkey.yaml, 8, 2, 9)	2m 51s
Main (jruby)	1m 58s
Main (truffleruby)	1m 30s
Main (test_cluster_broken, no, 6)	2m 10s
Main (8, 3.3, compose.valkey.yaml, 2)	1m 14s
Main (7.2, 3.2, compose.auth.yaml)	1m 2s
Main (7.0, 3.1)	1m 16s
Main (6.2, 3.0)	1m 17s
Main (5.0, 2.7)	1m 26s
Main (test_cluster_scale, Single, compose.scale.yaml, 8)	1m 14s
Main (test_cluster_scale, Pipeline, compose.scale.yaml, 8)	1m 19s
Main (test_cluster_scale, Transaction, compose.scale.yaml, 8)	1m 12s
Main (test_cluster_scale, PubSub, compose.scale.yaml, 8)	1m 45s
	56m 29s

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