Add kurtosis config for DAS testing

[jimmygchen]

Issue Addressed

Add kurtosis config for DAS testing:

• scripts/local_testnet/network_params_das_interop.yaml: for interop testing with all das-ready clients
• scripts/local_testnet/network_params_das_interop.yaml: for Lighthouse local testing.

To test locally:

cd scripts/local_testnet
./start_local_testnet.sh -n ./network_params_das_local.yaml

[jimmygchen]

CI fixed in #5966