Function revoke_from_env 

pub async fn revoke_from_env(non_interactive: bool) -> bool

Revokes the Nautilus builder fee using environment variables.

Reads private key from environment:

• Testnet: HYPERLIQUID_TESTNET_PK
• Mainnet: HYPERLIQUID_PK

Set HYPERLIQUID_TESTNET=true to use testnet.