Adds the test_hints_consistency_during_decommission test which
reproduces the failure observed in scylladb/scylla-dtest#4582. It uses
error injections, including the newly added
topology_coordinator_pause_after_streaming injection, to reliably
orchestrate the scenario observed there.
In a nutshell, the test makes sure to replay hints after streaming
during decommission has finished, but before the cluster switches to
reading from new replicas. Without the fix, hints would be replayed to
the decommissioned node and then would be lost forever after the cluster
start reading from new replicas.
6f3d0af994