fix(semaphore timed out severity): change severity of semaphore_timed_out event to WARNING
fix(semaphore timed out severity): change severity of semaphore_timed_out event to WARNING

Semaphore timed out event shouldn't fail the test. So we decided to lower it's severity.
Semaphore timed out message includes Exception and backtrace words also:
seastar - Exceptional future ignored: seastar::named_semaphore_timed_out
(Semaphore timed out: _read_concurrency_sem), backtrace:  ...

So I set priority to the SEMAPHORE_TIME_OUT event if there are another event types
in the message

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