These changes add a global dismissible banner for user that is:
on .com
enrolled in private code
is missing "private" scope for GitHub
Screenshot
Questions
When we display a global banner do we want to hide a similar alert on the "code host connections" page?
We'll make requests for grantedScopes only if the user does a full page refresh (unmount the top level app),
when user navigates between routes we don't make additional requests. Is it ok?
Doesn't this grantedScopes resolver code mean we'll show a global alert and an update button for GitHub code host if we can't resolve the scope or had and error?
