Fix Celo maxFeePerGas calculation for fee currency transactions

[shazarre]

Previously the multiply function was not applied to the base fee returned from the node. This PR fixes that.

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PR-Codex overview

This PR focuses on fixing the calculation of maxFeePerGas for fee currency transactions in the Celo network, ensuring accurate gas fee estimations and adjustments in tests.

Detailed summary

• Updated the calculation of maxFeePerGas in src/celo/fees.ts to use suggestedMaxFeePerGas.
• Adjusted mock return values for gas price and priority fee in src/celo/fees.test.ts.
• Changed expected values in the snapshot test for fees.
• Modified return values for gas price in src/celo/sendTransaction.test.ts.

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🦋 Changeset detected

Latest commit: 471a3f8

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[jeanregisser]

nit: Real requests to these RPC methods return Hex strings.

❯ curl --silent -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_gasPrice","params":[],"id":1}' https://forno.celo.org | jq
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x2540be400"
}

I guess here it still works because we parse them with BigInt(value). And Hex strings are accepted.