Split up E2E tests

[geoff-vball]

Context and scope
With the addition of ValidatorManger and ICTT contracts to this repo, running E2E tests serially is become cumbersome verging on ~15 minutes. We can split E2E tests into a few different parallel runs to speed up their completion in CI.

Discussion and alternatives
We can also set the workflows for the different tests to only trigger if the contracts or utils for those contracts have been edited. We could run all E2E tests on merges to main.