MONGOID-5839 Fix eager-loading from STI subclasses (#5934) (#5941) #3896

Job	Run time
ruby-3.2 driver-current mongodb-6.0 replica_set	13m 0s
ruby-3.1 driver-current mongodb-6.0 replica_set	13m 19s
ruby-3.0 driver-current mongodb-6.0 replica_set	13m 1s
ruby-3.1 driver-master mongodb-6.0 replica_set	13m 30s
ruby-3.0 driver-stable mongodb-6.0 replica_set	13m 21s
ruby-3.3 driver-current mongodb-7.0 server	11m 15s
ruby-3.2 driver-current mongodb-7.0 server	11m 20s
ruby-3.2 driver-current mongodb-7.0 server	11m 19s
ruby-3.1 driver-current mongodb-7.0 server	12m 6s
ruby-3.1 driver-current mongodb-6.0 server	12m 5s
ruby-3.0 driver-current mongodb-6.0 server	11m 46s
ruby-3.0 driver-current mongodb-6.0 server	11m 34s
ruby-2.7 driver-current mongodb-6.0 server	11m 26s
jruby-9.3 driver-current mongodb-6.0 server	19m 10s
ruby-3.1 driver-current mongodb-5.0 replica_set	13m 23s
ruby-2.7 driver-current mongodb-4.4 replica_set	12m 49s
	3h 24m 24s

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