Able to cancel WebAuthenticator.AuthenticateAsync programmatically using a CancellationToken #26137

[marcel-silva]

Description of Change:
This change introduces a new overload for WebAuthenticator.AuthenticateAsync that accepts a CancellationToken, allowing the authentication flow to be canceled programmatically.

Changes:

• Added the new AuthenticateAsync overload in IWebAuthenticator and platform-specific implementations.
• Updated the WebAuthenticator and WebAuthenticatorExtensions classes.
• Created new unit tests for the CancellationToken functionality.

Issues Fixed
Fixes #26137

[marcel-silva]

@dotnet-policy-service agree

…

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[jsuarezruiz]

/azp run

[jfversluis]

Hey @marcel-silva sorry this took a while! Are you still interested to get this over the finish line? If not, I will take over :)

First thing we need to do is target this against the net10.0 branch since it introduces new APIs. Thanks!

[marcel-silva]

go ahead please.

[jfversluis]

Done, thanks @marcel-silva! Was there any reason you didn't implement it for macOS?

I added that one now and made the "old" methods call the new ones so we avoid code duplication. I'd appreciate it if you could look over it to make sure I didn't do something dumb. Thanks for all your effort here!

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[rmarinho]

Failing tests not related. LGTM

[dotnet-policy-service]

🚨 API change(s) detected @davidbritch FYI

[jfversluis]

OK @marcel-silva thank you for the initial work here! You are now a .NET MAUI contributor!