MsalProvider constructor crashes unless you pass scopes

[asklar]

https://github.com/CommunityToolkit/Graph-Controls/blob/d985141a317c96ad571bd9dd8097e38969b649d6/CommunityToolkit.Authentication.Msal/MsalProvider.cs#L63

the default value for scopes is null, but we unconditionally run the Select(...) on it. Fix would be to either not provide a default argument for scopes (since it's arguably needed), or at least use scopes?.Select(...) so that we don't end up with a null deref. note there's 2 ctors with this issue

[ghost]

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