It is possible for the backend to prune the chain db which
will cause `waitForTransaction` to hang forever if the contract
was not recently deployed. Only check for the transaction if
it was recently deployed and instead add a safety check that
looks at the on chain code. It is unlikely to deploy a contract that
leaves no code in the state, so this is safe. The state cannot
be pruned so this will be a more reliable check to ensure that
the deployment is sane and exists. We do not use selfdestruct
so this is safe.