fix(prefer-find-by): ensure autofix wraps findBy* call inside expect(await …) when assertion is involved

[y-hsgw]

Checks

• I have read the contributing guidelines.

Changes

• This PR fixes an issue in the prefer-by-findby rule where the autofix incorrectly produced code missing the expect wrapper when an assertion was involved.

Target:

await waitFor(() =>
    expect(
      screen.getByRole('button', { name: 'Count is: 0' }),
    ).toBeInTheDocument(),
  )

Before (incorrect autofix output):

await screen.findByRole('button', { name: 'Count is: 0' })

Expected (correct output):

expect(
  await screen.findByRole('button', { name: 'Count is: 0' }),
).toBeInTheDocument()

Context

Fixes: #579