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.

• https://github.com/10gen/mongo/blob/4f403ab89f26fabedb5221574ef1ae15c3a0d936/jstests/multiVersion/genericSetFCVUsage/abort_unprepared_transactions_on_FCV_downgrade.js#L We should update this test to test that we abort unprepared transaction once we enter the downgrading FCV state specifically, not just when the full FCV downgrade completes.
• https://github.com/10gen/mongo/blob/4f403ab89f26fabedb5221574ef1ae15c3a0d936/jstests/multiVersion/genericSetFCVUsage/run_feature_flag_multiversion_test.js#LWe should update this test to test that feature flag behavior once we enter the downgrading FCV state specifically, not just when the full FCV downgrade completes.