## Description
Hardcode ed25519 to dialTCPFn in e2e tests.
I will backport `DefaultRequestHandler` fixes
This will be replaced when grpc is implemented.
Closes#5291. Adds a randomized testnet generator. Nightly CI job will be submitted separately. A few of the testnets can be a bit flaky, even after disabling known-faulty behavior and making minor tweaks, and the larger networks may be too resource-intensive to run in CI - this will be optimized separately.
