fix(is_streaming_started): timeout to wait streaming started increased
fix(is_streaming_started): timeout to wait streaming started increased

Some times the 200 seconds is not enough to detect that
streaming(repair) process started during
"break_streaming_task_and_rebuild" execution method.

This happened during one of latest 7d-1tb job, when
due to race between streaming_task_thread and waiting
streaming started
nodetool rebuild was executed twice and faile the job

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests