tests: simple_schema: Introduce get_value(const clustered_row&) helper
tests: simple_schema: Introduce get_value(const clustered_row&) helper

duarten/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla