Post published local notification doesn't launch to correct section of the app

Uncovered in #15150, we discovered that the local notification that appears after a post is successfully published doesn't launch to the correct section of the app.

ShareNoticeNavigationController.navigateToPostList(with:) is called from InteractiveNotificationsManager, which in turn calls ShareNoticeNavigationController.fetchPost(from:onSuccess:onFailure:). This expects a post ID and a site ID in the user info of the notification, but it appears that we're only including a post ID with the post published notice that we're sending. Because there's no blog ID, the lookup fails.

However, there appears to be another issue – the post ID in the userInfo dictionary is actually the Core Data object ID. So there are two possible fixes:

• Update fetchPost(from:onSuccess:onFailure:) to look up the post using the Core Data object ID that it receives
• Update the code that sends the post published notice to correctly include a post ID and site ID

Steps to reproduce the behavior

• Put a breakpoint in ShareNoticeNavigationController.fetchPost(from:onSuccess:onFailure:)
• Ensure that you've allowed notifications for the WPiOS app
• Open the editor, enter some content, and publish the post
• Quickly background the app, and wait for a system notification to appear confirming that the post was published
• Tap the notification and step through the method

Tested on iPhone 12 simulator, iOS 14, WPiOS 16.0