bug: bad sequence number for minting and account creation

[l-monninger]

Summary

When sending multiple minting requests, the sequence number for the transactions on the root account is not appropriately incremented resulting in add_txn to return a status Transaction is already in mempool with a different payload and thereby not minting the new account. This also seems to lock up execution generally.

Steps to Reproduce

You can reproduce this one while running locally and pumping the network with a bunch of transactions.

From the m1 dir:

1. ./scripts/run.debug.sh
2. `cargo run -p e2e-benchmark

On the dev branch, you will see attempts to resolve this error that have additional logging and thus make it a little easier to continue.