WindowsAppSDK [1.7 servicing] WinAppSdk 1.7 installer not able to install Singleton package when WinAppSdk 1.6 is installed and 1.6 Singleton is being used in the background

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This is a back-port of #5445 to release/1.7-stable. https://task.ms/58022587

Jun 18 '25 22:06 ssparach

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Jun 24 '25 17:06 ssparach

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