fix: optimism gas refunds

[Wollac]

Prior to the Regolith update, deposit transactions should not receive gas refunds as ETH. For all other cases, non-deposit or post-regolith gas refunds are handled as in Mainnet.

[Wollac]

I am a bit confused as to why test_consume_gas_with_refund fails. This should now match exactly the version before the API changes:

revm/crates/revm/src/handler/optimism.rs

Lines 84 to 89 in b28c154

	let is_gas_refund_disabled = env.cfg.optimism && is_deposit && !SPEC::enabled(REGOLITH);
	if is_gas_refund_disabled {
	0
	} else {
	mainnet::calculate_gas_refund::<SPEC>(env, gas)
	}

And my full OP block execution tests with this PR pass while I was getting receipt mismatches before.

[gakonst]

cc @clabby

[Wollac]

Actually, the test was wrong.
With #888, the optimism tests were simply copied over, but before that, handle_call_return did not include the refund calculation, which happened in calculate_gas_refund. Now both happen in first_frame_return and the tests need to be adapted.

To make this a bit clearer, I also renamed handle_call_return to first_frame_return, which is the actual name in the handler.

[rakita]

Makes sense! would want to check it up as I messed it up, but it will be merged today. Thank you!