feat(jest-circus): add test.step() method for test step reporting

[quick123-666]

Summary

Adds test.step() / it.step() method to Jest's circus test runner, similar to Playwright's test.step. This allows users to add named steps within a test body for better error reporting.

Features

• test.step(title, body) - wraps a test step with a descriptive name
• Nested steps are supported (displayed as parent > child in error messages)
• Errors thrown inside a step include the step path in the error message
• Works with both sync and async callbacks
• Compatible with concurrent tests via AsyncLocalStorage
• TypeScript types included

Usage

it('should log in successfully', async () => {
  await it.step('Navigate to login page', async () => {
    await page.goto('https://example.com/login');
  });

  await it.step('Fill credentials', async () => {
    await page.fill('#username', 'user');
    await page.fill('#password', 'pass');
  });

  await it.step('Submit form', async () => {
    await page.click('#submit');
    await expect(page.locator('.welcome')).toBeVisible();
  });
});

If a step fails, the error message includes the step path:

step "Fill credentials": expect(received).toBe(expected) // Object.is equality

Closes #16027

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