simulators/ethereum/graphql: change account queries to be on block, not account

[renaynay]

This PR changes several testcases from querying on account to querying on block for account information. Queries on account are not required by the graphql spec. While Besu implements queries on account, geth does not as it is not required.

[fjl]

I don't fully understand which queries are unsupported. Do you mean account { ... } is not supported, but block { account { ... } } is supported?

The JSON-RPC compatibility table in EIP-1767 contains this row:

eth_getBalance | IMPLEMENTED | { account(address: "0x...") { balance } }

So I guess this query should be supported?

[renaynay]

It was never required by the graphql spec though and we don't have it implemented. Should we implement support for queries on account then in geth?

[fjl]

We talked about this in a call and decided couple things:

• Basic change to add block { } around account query in tests is OK and besu guys also agreed with this change
• Let's not add the multiple-status-code feature to tests. It will cause all tests to pass with all clients even though the clients disagree on basic things.
• Account does not exist exception should be removed in besu

[renaynay]

Account exception was removed in Besu and status code returned is now 200, after fixing merge conflicts and removing the option for multiple status codes, can we merge this?

[holiman]

Oh, did I merge them in wrong order? Now there are conflicts (oops)

[renaynay]

Yes, but it's okay :) I can fix them, thanks @holiman