JS console error when closing Feature Tour.

## Bug Description

When closing a Feature Tour, the following error is displayed in the JS console:

> Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.
> in Joyride (created by TourTooltips)
> in TourTooltips (created by FeatureTours)

## Steps to reproduce

1. Start any Feature Tour, or open the [`TourTooltips` story](https://google.github.io/site-kit-wp/storybook/develop/?path=/story/global--tourtooltips) in Storybook.
2. Open the JS console.
3. Close the tour.
4. See the error in the console.

## Screenshots

https://user-images.githubusercontent.com/18395600/208684388-d4379996-46cc-4517-9969-99eb788c9e66.mp4

## Additional Context

- PHP Version: any
- OS: any
- Browser: any
- Plugin Version: 1.89.0
- Device: any

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## Acceptance criteria

* Closing a Feature Tour should not result in a JS console error.

## Implementation Brief
* Using `assets/js/googlesitekit/datastore/user/feature-tours.js`, within `dismissTour`, dismiss the tour (`DISMISS_TOUR` action), last, i.e after `yield fetchDismissTourStore.actions.fetchDismissTour( slug );`.

### Test Coverage
* No new tests to be added.

## QA Brief

* Check any feature tour and verify that it works as intended (nothing has changed) and there are no js console errors in the browser.

## Changelog entry

*