SERVER-48476 is adding a wait during index builds that can cause a hang in some replica_sets tests when resumable index builds are enabled. As a part of this ticket, we should resolve these hangs.
make index builds non-resumable when commit quorum is disabled
Transition to rollback doesn't need to clear out the majority committed snapshot's timestamp.
resumable index build should use majority read cursor for collection scan
Enable rollback testing for resumable index builds in the collection scan phase