MONGOID-5836 Don't repeat callbacks for embedded grandchildren. (backport to 8.0-stable) #3902

Job	Run time
ruby-3.1 driver-current mongodb-5.0 server	11m 5s
ruby-3.1 driver-current mongodb-5.0 replica_set	13m 6s
ruby-3.0 driver-current mongodb-5.0 server	11m 0s
ruby-3.0 driver-current mongodb-5.0 replica_set	12m 46s
jruby-9.3 driver-current mongodb-5.0 replica_set	22m 6s
ruby-2.7 driver-current mongodb-4.4 server	11m 25s
ruby-2.7 driver-current mongodb-4.4 replica_set	13m 2s
ruby-2.6 driver-current mongodb-4.0 server	1s
ruby-2.6 driver-current mongodb-4.0 replica_set	1s
ruby-2.6 driver-current mongodb-3.6 server	1s
ruby-2.6 driver-current mongodb-3.6 replica_set	1s
ruby-3.1 driver-master mongodb-5.0 replica_set	13m 8s
ruby-3.0 driver-stable mongodb-5.0 replica_set	12m 49s
ruby-2.6 driver-oldstable mongodb-4.0 replica_set	1s
ruby-2.6 driver-min mongodb-4.0 replica_set	1s
ruby-2.6 driver-min mongodb-3.6 server	1s
ruby-3.1 driver-current mongodb-5.0 server	10m 52s
ruby-3.1 driver-current mongodb-5.0 server	10m 53s
ruby-3.0 driver-current mongodb-5.0 server	11m 4s
ruby-3.0 driver-current mongodb-5.0 server	11m 14s
ruby-3.0 driver-current mongodb-5.0 server	10m 50s
ruby-2.7 driver-current mongodb-4.0 server	1s
ruby-2.6 driver-current mongodb-4.4 server	10m 31s
ruby-2.6 driver-current mongodb-4.2 server	1s
ruby-2.6 driver-current mongodb-4.2 server	1s
ruby-2.7 driver-current mongodb-5.0 server	10m 58s
jruby-9.3 driver-current mongodb-5.0 server	19m 55s
	3h 36m 54s

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