Replace existing RealtimeBox implementation with RealtimeBoxBestEffort implementation #76

Job	Run time
binary (humble, main) / humble main	1m 59s
binary (humble, testing) / humble testing	1m 53s
binary (iron, main) / iron main	1m 52s
binary (iron, testing) / iron testing	1m 36s
binary (rolling, main) / rolling main	2m 8s
binary (rolling, testing) / rolling testing	1m 57s
	11m 25s

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