`aspire deploy` with typescript apphost should have better default Azure Resource Group

When you `aspire deploy` the `Starter App (Express/React)` template, the default suggested Resource Group is: `rg-aspire-aspire-managed`.

We should fix that so it defaults to the app name. In my case, when I ran the template I gave it `TestTS`, so the default Resource Group should be `rg-aspire-testts`