Add e2e tests for Indexed DB

[l-monninger]

Summary

Currently, the Indexed DB does not have any e2e tests. There are several complications which have seen these added and removed, but which should resolvable going forward:

• Until Bridge Mvt -> Eth transfer e2e Test #690, local testing had of the bridge had been broken.
• We would want to use sqlite with a :memory: connection type. However, the generics for different diesel::Connection are very difficult to work with.
• sqlite and postgres do not support the same fields or query types out of the box.