Store creation M2: success screen

[jaclync]

Part of #8118

Description

This PR included just a new screen, StoreCreationSuccessView and its hosting controller, which is shown once the site becomes Atomic after a successful purchase of an eCommerce plan. I was hoping to integrate with IAP before this PR, but there is a backend issue and I haven't been able to make a successful IAP yet. In the next PR, I'm going to make a mock IAP implementation so that we can test the whole flow more easily.

The preview view is using WebView to show the given site URL, with interactions disabled. The preview CTA brings up a Safari sheet to see the site in fullscreen.

Testing instructions

Please feel free to check the SwiftUI previews, or modify the code to see this screen in action wherever there's a Site available. For example, you can replace the code in the store picker with:

        guard let url = URL(string: site.url) else {
            return
        }
        let successView = StoreCreationSuccessHostingController(siteURL: url) {}
        navigationController?.pushViewController(successView, animated: true)

Screenshots

light	dark	preview

---

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr8141-a696db6 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[itsmeichigo]

LGTM!

[itsmeichigo]

Suggestion: Instead of using this extra VStack to wrap the ScrollView and the bottom view, you can also pin the bottom view to the bottom of the safe area like so:

ScrollView {
    // some content here...
}
.safeAreaInset(edge: .bottom) {
    // bottom view here...
}

[jaclync]

I was going to try this after reviewing your PR 😄 this works like a charm, updated in a696db6

[peril-woocommerce]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 2 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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