Closes: #8423

Description

When opening an order universal link from a store that is already chosen and visible in the app, it navigates to the orders tab but doesn't open the order details. When it has to switch sites, i.e the link is pointing to an order of a user's site that is not selected in the app, it works correctly.
The reason behind this is that we were returning false on the switchToStore completion callback because it actually didn't switch sites, as the site was already there. Once we got that, we took it as if the app failed to switch to the order's site in navigateToOrderDetails, thus not showing the order's details.
To fix it, I rename the switchToStore function in MainTabBarController to showStore, to make it more meaningful -we want to show the site, we don't care if we had to switch sites or it was present already- and return true if the the site was already shown.

Testing instructions

1. Create a link with the format https://www.woocommerce.com/mobile/orders/details?blog_id=blog_id&order_id=order_id where blog_id = your site id that is selected in the app and order_id = an order of that site. Add that link to your email or notes app as shown in the video.
2. Tap on that link
   Result: The app is opened and navigates to the Orders tab but the order details screen is not shown
   Expected Result: It should show the Order Details

Screenshots

Buggy behavior

Fixed behavior

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