Make sure `no-unnecessary-act` detects unnecessary `act` called before the `render` method

What rule do you want to change?

no-unnecessary-act

Does this change cause the rule to produce more or fewer warnings?

More warnings

How will the change be implemented?

I don't have a plan to implement the change yet.
The idea is to improve the rule no-unnecessary-act so it can detect unnecessary act which are called before a render.
https://github.com/testing-library/eslint-plugin-testing-library/blob/main/docs/rules/no-unnecessary-act.md
Those unnecessary make the codebase noisy.

Example code

act(() => {
  someSetupMethod();
});

render(<Example />);

How does the current rule affect the code?

This unnecessary act is not detected

How will the new rule affect the code?

This unnecessary act is detected

Anything else?

No response

Do you want to submit a pull request to change the rule?

Yes, but need help

Start with the no-unnecessary-act rule documentation linked in the issue, then locate the rule implementation and its existing coverage. The change is complete when an unnecessary act call before render is reported without incorrectly flagging necessary usage.