This commit updates `SessionAutoConfiguration` to ensure it is processed
after `MongoDataAutoConfiguration` and
`MongoReactiveDataAutoConfiguration`, instead of `MongoAutoConfiguration`
and `MongoReactiveAutoConfiguration`. This is required in order for
MongoDB Session auto-configuration to work, since
`MongoSessionConfiguration` and `MongoReactiveSessionConfiguration` are
conditional on `MongoOperations` and `ReactiveMongoOperations` beans,
respectively.

Closes gh-11054