Allow running e2e tests against tendermint/cometbft rpc

[gartnera]

We currently require a gRPC endpoint to run the e2e tests. This makes it hard to debug them locally against real networks.

We should be able to proxy all gRPC requests via the cometbft /abci_query

[lumtis]

Chaning label FYI, feature:idea is more for user/dev facing new features