[Authentication][MSAL] Add back support for auth through WAM

[kazo0]

Afaik opening the account picker in the default browser is the recommended approach as per the latest security standards (instead of the embedded browser) - the docs say so quite overwhelmingly as well - https://learn.microsoft.com/en-us/entra/msal/dotnet/acquiring-tokens/using-web-browsers#embedded-web-view-vs-system-browser

Correct for a browser based approach - however the desired and recommended behavior on Windows is to use the native WAM, which is built into the OS:
https://learn.microsoft.com/en-us/entra/msal/dotnet/acquiring-tokens/desktop-mobile/wam

Using the native Windows WAM was the behavior up to Uno.Sdk 5.2.139, which was broken in 5.2.175; that is what I referred to in this issue:

Expected behavior
I can update to the latest stable Uno Sdk and continue to use the native account picker on Windows with the Uno Auth Extensions.

Originally posted by @VincentH-Net in #2443 (comment)

Allow the MSAL Auth Extensions to be configured to use the WAM (https://learn.microsoft.com/en-us/entra/msal/dotnet/acquiring-tokens/desktop-mobile/wam). This will require a change to the IApplicationBuilder flow so that the instance of the main application Window can be retrieved and passed to .WithParentActivityOrWindow

[kazo0]

Follow these comments: #2631 (comment)

We should be replacing the PackageReference for Microsoft.Identity.Client.Desktop with Microsoft.Identity.Client.Broker

[kazo0]

Fix for this should be backported to release/stable/5.2