Function validate_initial_tx_gas 

pub fn validate_initial_tx_gas(
    tx: impl Transaction,
    spec: SpecId,
    is_eip7623_disabled: bool,
    is_amsterdam_eip8037_enabled: bool,
    tx_gas_limit_cap: u64,
) -> Result<InitialAndFloorGas, InvalidTransaction>

Validate initial transaction gas using the default GasParams for the given SpecId.

For custom gas parameters (e.g. configured on the context), use validate_initial_tx_gas_with_gas_params.