Re-Implement integration tests for the system

[apbendi]

• UniStaker integration tests were broken and removed by the modifications made, we should reintroduce integration tests again
• Broadly speaking there are two kinds of integration tests we can write
  • Implementation specific unit tests that fork from real chain state for a specific DAO: e.g. ARB/Arbitrum specific testing
  • Tests that exercise the full system end to end locally without mocks or fakes, but not using a concrete instance onchain
• Ideally, we might find a way to abstract the integration tests such that they could be run in both of the aforementioned contexts
  • Inherit from an abstract test suite, implement a few methods, including setUp, and then the test suite will run agains that scenario. This could be used for a locally set up version, for Arb specifically in fork tests, but also (in theory) for other concrete DAO instances in the future