As part of PM-2974, we audited the genericSetFCVUsage tests to try and increase test coverage of the server running as normal while in the downgrading FCV state.

• tenant_migration_donor_abort_on_fcv_change.js - we should investigate updating the test to test that tenant migration is aborted when the FCV is changed to the downgrading FCV state, not just when the FCV downgrade fully succeeds
• tenant_migration_donor_recipient_fcv_mismatch.js - we should test that tenant migration is unable to start if the donor or recipient is in the middle of the downgrading FCV state
• tenant_migration_donor_recipient_fcv_mismatch_after_failover.js - we should test that restarting a migration attempt after a failover fails if the donor and recipient no
  longer share the same FCV and one of them is in the middle of the downgrading FCV state.
• tenant_migration_recipient_abort_on_fcv_change.js - we should test that recipient aborts migrations when its FCV changes to the downgrading FCV state, not just when the FCV downgrade succeeds.
• tenant_migration_save_fcv.js - we should test that recipient aborts migrations when its FCV changes to the downgrading FCV state, not just when the FCV downgrade succeeds.