The cql_test_env has a virtual require_column_has_value() helper that better fits cql_assertions crowd. Also, the helper in question duplicates some existing code, so it can also be made shorter (and one class table helper gets removed afterwards)
Closes#15208
* github.com:scylladb/scylladb:
cql_assertions: Make permit from env
table: Remove find_partition_slow() helper
sstable_compaction_test: Do not re-decorate key
cql_test_env: Move .require_column_has_value
cql_test_env: Use table.find_row() shortcut