.NET 7: Update doc about UseAuthentication() and UseAuthorization() methods

It looks there are some important changes in authentication/authorization configuration in .NET 7. Here https://github.com/dotnet/aspnetcore/pull/42802 we can read that calls to `UseAuthentication()` and `UseAuthorization()` where removed from templates. A few weeks later here https://github.com/dotnet/aspnetcore/commit/63750b9ab756b6b86cba95c44b56e4cc9919ed0e a call to `UseAuthorization()` was added, but there is no call to `UseAuthentication()`. This strange change should be documented. I have found some discussion here https://github.com/dotnet/aspnetcore/issues/39855. Maybe @DamianEdwards or @captainsafia can help.

There are a lot of pages in the documentation where we can see calls to both methods. We can also read that it is important to have UseAutentication before UseAuthorization. All this information have to be verified and corrected.

---
#### Document Details

⚠ *Do not edit this section. It is required for learn.microsoft.com ➟ GitHub issue linking.*

* ID: 94bfd895-d2af-390b-0801-428b36a27ff4
* Version Independent ID: 0e0d870e-e49a-e16c-c259-68d58e701b8f
* Content: [Introduction to Identity on ASP.NET Core](https://learn.microsoft.com/en-us/aspnet/core/security/authentication/identity?view=aspnetcore-7.0&tabs=visual-studio)
* Content Source: [aspnetcore/security/authentication/identity.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/identity.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-security**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **riande**