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compaction_read_monitor_generator is an existing mechanism for monitoring progress of sstables reading during compaction. In this change information gathered by compaction_read_monitor_generator is utilized by task manager compaction tasks of the lowest level, i.e. compaction executors, to calculate task progress. compaction_read_monitor_generator has a flag, which decides whether monitored changes will be registered by compaction_backlog_tracker. This allows us to pass the generator to all compaction readers without impacting the backlog. Task executors have access to compaction_read_monitor_generator_wrapper, which protects the internals of compaction_read_monitor_generator and provides only the necessary functionality. Closes scylladb/scylladb#14878 * github.com:scylladb/scylladb: compaction: add get_progress method to compaction_task_impl compaction: find total compaction size compaction: sstables: monitor validation scrub with compaction_read_generator compaction: keep compaction_progress_monitor in compaction_task_executor compaction: use read monitor generator for all compactions compaction: add compaction_progress_monitor compaction: add flag to compaction_read_monitor_generator