fix: allow configurable max startup samples #568

Job	Run time
Benchmark	2m 15s
Massive Cluster	2m 48s
Lint	14s
Main (7.0, 3.2)	42s
Main (7.0, 3.2, compose.ssl.yaml)	1m 12s
Main (7.0, 3.2, hiredis)	49s
Main (7.0, 3.2, hiredis, compose.ssl.yaml)	55s
Main (7.0, 3.2, 2, compose.replica.yaml)	57s
Main (7.0, 3.2, compose.auth.yaml)	45s
Main (6.2, 3.1)	56s
Main (6.2, 3.0)	48s
Main (5.0, 2.7)	1m 13s
Main (jruby)	1m 21s
Main (truffleruby)	1m 15s
Main (test_cluster_state, 7.0, 2, compose.replica.yaml)	3m 5s
Main (test_cluster_state, 6.2, 2, compose.replica.yaml)	2m 52s
Main (test_cluster_broken, 7.0, no)	1m 45s
Main (test_cluster_broken, 6.2, no)	1m 59s
Main (test_cluster_scale, 7.0, compose.scale.yaml)	1m 56s
Main (test_cluster_scale, 6.2, compose.scale.yaml)	1m 55s
NAT-ted Environments	48s
Profiling (single)	41s
Profiling (excessive_pipelining)	41s
Profiling (pipelining_in_moderation)	38s
	32m 30s

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