Make faucet only for testnet

[ygao76]

Summary

check network Id for faucet command.

Testing Plan

local yarn start faucet

yajun@Yajuns-MBP ironfish-cli % yarn start faucet
yarn run v1.22.19
$ yarn build && yarn start:js faucet
$ tsc -b
$ cross-env OCLIF_TS_NODE=0 IRONFISH_DEBUG=1 node --expose-gc --inspect=:0 --inspect-publish-uid=httpt

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Breaking Change

Is this a breaking change? If yes, add notes below on why this is breaking and
what additional work is required, if any.

[ ] Yes

[dguenther]

Could you also add the chain/getNetworkInfo to the RPC docs in https://github.com/iron-fish/website ? We just added those yesterday lol