AcquireTokenInteractive should not throw on NetCore when using a CustomWebUI

[bgavrilMS]

MSAL 3.0.3-preview

User this code on .NetCore

await pca
                .AcquireTokenInteractive(s_scopes)
                .WithCustomWebUi(someWebUI)
                .ExecuteAsync(new CancellationTokenSource(_interactiveAuthTimeout).Token)
                .ConfigureAwait(false);

Expected: this should work
Actual:

System.PlatformNotSupportedException: 'On .NET Core, interactive authentication is not supported. Consider using Device Code Flow https://aka.ms/msal-net-device-code-flow or Integrated Windows Auth https://aka.ms/msal-net-iwa'

[bgavrilMS]

I propose we fix this before removing the -preview tag as well. It's an easy fix, we just need to improve the validation and move it somwhere else. Feel free to propose a new milestone if you disagree @jmprieur

[jmprieur]

yes, go ahead @bgavrilMS
this bugs defeats a bit the purpose of the custom Web UI on that platform :)

[jennyf19]

Included in MSAL.NET 3.0.6-preview release