Run selected jest mocks globally

[acouch]

Summary

There are a number of mocks, more with the React 19 upgrade, that are added to individual tests. Some of these, such as mocking use on every sync page:

jest.mock("react", () => ({
    ...jest.requireActual<typeof import("react")>("react"),
    use: jest.fn(() => ({
      locale: "en",
    })),
  }));

and internationalization mocks

jest.mock("next-intl/server", () => ({
  getTranslations: () => identity,
  setRequestLocale: identity,
}));

jest.mock("next-intl", () => ({
  useTranslations: () => useTranslationsMock(),
  useMessages: () => mockMessages,
}));

could be pulled out into jest.setup.js or other setupFilesAfterEnv file.

Acceptance criteria

• less mocking, more rocking 🎸