Add trilogy to multiverse test suite

[kaylareopelle]

We had problems testing with mysql2 on newer Rails versions, so we created a separate multiverse suite dedicated to testing the pg gem with Active Record and began testing the newer Rails versions (6.0+) only with pg.

Now, trilogy may provide us with an option to more easily test mysql with newer Rails versions. We may be able to extend the existing active_record_pg suite to test other database adapters as well, or may create a new suite specifically for trilogy.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-340784