test: Add test for cross_shard_barrier::abort()
test: Add test for cross_shard_barrier::abort()

The tests runs a loop of arrivals each of which can randomly
throw before arriving. As the result the test expects all shards
to resolve into exception in the same phase.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla