This trial patch set moves compaction_strategy.hh and compaction_garbage_collector.hh to compaction directory and drops two unused compact_for_mutation_query_state and compact_for_data_query_state. Closes #9156 * github.com:scylladb/scylla: compaction: Move compaction_garbage_collector.hh to compaction dir compaction: Move compaction_strategy.hh to compaction dir mutation_compactor: Drop compact_for_mutation_query_state and compact_for_data_query_state