feat(test): support unstubbing actions

[CyberAP]

This change makes it possible to unstub actions when using stubActions: true in createTestingPinia. To do that you have to call mockRestore on the action.

createTestingPinia()

useMyStore().someAction.mockRestore()

// this calls an actual implementation
useMyStore().someAction()

The support for unstubbing is provided only for jest and vitest.

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[lostncg]

This feature is useful, may I know when it gonna release? @posva