Only refresh My Store stats data when a new order is placed for the site.

[JorgeMucientes]

wc-analytics endpoint is one of the slowest endpoints in the app, and is one that we hit a lot. We fetch site stats and top performers every time we open My Store tab and when we change between tabs.

To reduce the number of requests done to the wc-analytics endpoint, while keeping the data fresh, we will:

• Migrate existing top performer products cache to use Room so we can apply an observable approach: PR
• Invalidate top performer products cached data whenever a new order is placed. Here and in Feature/6618 limit stats refresh #7411
• Add an expiration policy to cached data to top performer products, and refresh it when expired: Feature/6618 limit stats refresh #7411
• Add an expiration policy to cached data to stats, and refresh it when expired
• Invalidate Store stats cached data whenever a new order is placed.

Visitor stats are not included as part of this caching/invalidating policy. Visitor stats should always be refreshed.

More details here: p91TBi-8yY-p2 and here p91TBi-8V6-p2

[peril-woocommerce]

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