Fix generic wrong strings to comply with the UX guideline

- The generic error need to remove "Unavailable" in the header and
only show body text.
- The "Play Store" app needs to be added to the error for a specific
app and it says "Play Store not available".
- Dialer app uses generic alert dialog.

Bug: 230048652
Test: Manual, atest FrameworksServicesTests:VirtualDeviceManagerServiceTest
Change-Id: I8b56e2804c3204901a3551d3300ab8c0391e7260