feat: remove free airdrop

[GabrielePicco]

Greptile Summary

Removed free airdrop functionality and payer configurations across the MagicBlock validator, transitioning towards a gasless transaction model.

• Removed payer_init_lamports field and related configurations from configs/ephem-devnet.toml and configs/ephem-testnet.toml, eliminating automatic account funding
• Simplified fee payer account cloning in magicblock-account-cloner/src/remote_account_cloner_worker.rs by using standard do_clone_undelegated_account method for non-charging validators
• Removed Payer struct and related functionality from magicblock-config/src/accounts.rs, including configuration validation and environment variable handling
• Modified account initialization logic in magicblock-api/src/magic_validator.rs to support gasless transactions while maintaining validator identity and faucet account funding

[greptile-apps]

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[bmuddha]

Looks legit, I'm not intimately familiar with all the internals of the feepayer workaround, but it looks like great care was taken to clean it up.