roachtest: fix flakey follower read roachtest #34711
Merged
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The follower read roachtest sustains reads against followers and verifies that
the 90th %-ile latency never exceeds 20ms. During certain situations like lease
transfer, the latency may jump up. This change now runs the sustained reads for
longer (3 minutes instead of 1) and verifies that the latency is low at least
80% of the time. This should be much less fragile.
Fixes #34701.
Release note: None