internal/ethapi: ethSendTransaction check baseFee

[jsvisa]

This is a similar issue to #27833, but this is for the eth_sendTransaction RPC.

When I send the transaction with

• gasPrice=1 => failed ❌
• gasPrice=0 => success 🆗

After some dig, and talking with @rjl493456442 found the issue occurred by estimateGas,

the stack trace as below:

So when I call estimateGas, I distinguish between a call from eth_call or submitted transaction

[rjl493456442]

I think the main issue is that we allow zero price transactions from RPC, these transactions
are invalid if 1559 is activated. We can add the check in an alternative approach:

• if the 1559 is activated
• reject the 0 price tx in the rpc level

This check can be done https://github.com/ethereum/go-ethereum/blob/master/internal/ethapi/transaction_args.go#L135

[holiman]

Some historic background: #23027

[jsvisa]

@rjl493456442 @holiman please take another look, I changed to check the gasPrice zeroable after London only.