Issue with vi.unmock

If a module is mocked using vi.mock, a subsequent call to vi.unmock will not unmock the module if the auto-imitation feature was used.

Reproduction

pnpm install
pnpm test

There are three tests in mock.test.ts, which mock out a dependency in dependency.ts.

1. A test using vi.doMock with implcit replacement
2. A test using vi.doMock with explicit replacement (skipped)
3. A test using no replacement, relying on a call to doUnmock in an afterEach hook

If (1) and (3) are run together, the module is not unmocked, and the call to import in (3) returns the mocked module instead of the real one, failing the test. If (1) is skipped instead, and (2) and (3) are run together, the module is successfully unmocked, allowing (3) to pass.