`boa.env.fork` is allowed on NetworkEnv but will broadcast transactions

[PatrickAlphaC]

I can run:

boa.env.fork(URL, deprecated=False)

And then, if I deploy a contract or try to send a TX, if I have an account added, it will broadcast the transaction instead of running it on the pyevm.

This should be disabled, you should not be able to send transactions on a real network when the API makes you think you are on a forked network.