awaitPrimaryAppliedSurpassesRollbackApplied was added to RollbackTest as part of
SERVER-48518. This helper is needed for rollbacktests that run RVR pass. We should copy these to RollbackTestDeluxe so that that tests like rollback_all_ops_types.js and rollback_collmods.js pass in the EMRC=false variant.
Alternatively we can blacklist these tests from the EMRC=false variant but I'm not sure we want to lose that test coverage.