Currently, to find the operation with given id, all operations tracked by a virtual task are listed. This isn't necessary, since we only need info regarding one particular operation. Add a method to check whether a virtual task tracks the operation with the given id. No backport needed Closes scylladb/scylladb#20769 * github.com:scylladb/scylladb: tasks: delete virtual_task::get_ids method as it is unused tasks: improve task_manager::lookup_virtual_task