Feat/long running epoch testing

[joshLong145]

Adds long running tests for epoch transitions to #549 Brings back the test harness within tinny for long running tests as jest does not allow for a timeout configuration to be omitted. This causes issues when trying to perform long running tests which could take over the timeout period due to epoch transitions taking variable amounts of time.

Looking into swapping the custom runner for the built in node test harness implementation.