Final feature update and deprecate support for Visual Studio 2017

[grochocki]

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Microsoft mainstream support for VS2017 ended on April 12, 2022 (lifecycle). To unblock updating to a newer version of Newtonsoft.Json that addresses security vulnerabilities, we must deprecate XAML Styler support for VS2017. More information here: Using Newtonsoft.Json in a Visual Studio extension.

We plan to publish one final feature update with the latest payload supporting VS2017 after #479 is addressed before removing support.