Improve launchTestNode integration with typegen contract factories

[nedsalk]

Once #2707 goes through, the interface of launchTestNode can be simplified:

import { launchTestNode } from 'fuels/test-utils';
import { CallTestContractAbi__factory } from '../test/typegen/contracts';

const {
    contracts: [contract],
    cleanup,
  } = await launchTestNode({
    contractsConfigs: [ 
      CallTestContractAbi__factory, 
      { factory: CallTestContractAbi__factory, options: { storageSlots: {}, ... } }
    ],
  });

The contractsConfigs can now accept a factory directly without having to specify the bytecode field

contractConfigs: [ CallTestContractAbi__factory ]

but there can still be flexibility for when users want to use DeployContractOptions via the options property:

contractConfigs: [ { factory: CallTestContractAbi__factory, options: { storageSlots: {}, ... } } ]

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• blocked by Add bytecode to factory outputted by typegen #2707