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This PR implements a simple optimization to declutter the booking queue from repeated entries.
Context: When cuebot is under pressure due a high amount of jobs on the the queue and a high amount of HostReports being submitted, the BookingQueue threadpool might receive repeated tasks, from which only one will actually be executed successfully.
This change uses a cache to make sure no repeated tasks are submitted to the threadpool.
This is running on production in the spi environment for over 3 months.