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This path set fixes stalls in repair that are caused by std::list merge and clear operations during test_latency_read_with_nemesis test.
Fixes#6940Fixes#6975Fixes#6976
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* 'fix_repair_list_stall_merge_clear_v2' of github.com:asias/scylla:
repair: Fix stall in apply_rows_on_master_in_thread and apply_rows_on_follower
repair: Use clear_gently in get_sync_boundary to avoid stall
utils: Add clear_gently
repair: Use merge_to_gently to merge two lists
utils: Add merge_to_gently