test: costs assertions

[hugocaillard]

Costs are enabled with

"test": "vitest run -- --costs",

Then

    const { costs } = simnet.callReadOnlyFn(
      "counter",
      "get-count",
      [],
      address1,
    );
    expect(costs?.total.readCount).toBe(4);
    expect(costs?.total.writeCount).toBe(0);

[codecov]

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