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* Extract `act` environment check into function `act` checks the environment to determine whether to fire a warning. We're changing how this check works in React 18. As a first step, this refactors the logic into a single function. No behavior changes yet. * Use IS_REACT_ACT_ENVIRONMENT to disable warnings If `IS_REACT_ACT_ENVIRONMENT` is set to `false`, we will suppress any `act` warnings. Otherwise, the behavior of `act` is the same as in React 17: if `jest` is defined, it warns. In concurrent mode, the plan is to remove the `jest` check and only warn if `IS_REACT_ACT_ENVIRONMENT` is true. I have not implemented that part yet.