feat: add basic e2e test to ensure block production on both chains

chore: cleanup

chore: fmt and remove unused file

fix: oops wrong e2e.nix

feat: rename e2e/e2e to e2e/ensure-blocks

and some other cleanup

chore: remove extraneous comment

chore: fix workspace Cargo.toml exclude members

feat: filter ensure-blocks test properly in ci

feat: rename ensure-blocks test internally

feat: check for if sepolia runs

fix: lodestar restart = always

feat: add union-runs

fix: output to file properly

feat: refactor and clean up e2e tests