WindowsAppSDK Encode AppNotificationBuilder URIs

URIs used in AppNotificationBuilder weren’t encoded, so if they contained characters like &, calling the BuildNotification method would fail with a System.Runtime.InteropServices.COMException, specifically stating semicolon expected.

With this PR, I call the EncodeXML function (already used in some parts of the code) for all the URIs present in the file.

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Dec 10 '25 19:12 Diegorro98

/azp run

Dec 10 '25 21:12 guimafelipe

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Dec 10 '25 21:12 azure-pipelines[bot]