Fix collection PRometheusSnapshot upon varios exception (#1436)
Fix collection PRometheusSnapshot upon varios exception (#1436)

Checking of Prometheus snapshot was done only by custom exception,
if any other exception raised, full code of snapshot creation failed.

Fixing this issue
scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests