NuGet Product(s) Involved
Visual Studio Package Management UI
The Elevator Pitch
In addition to #12398, a notification should appear in Visual Studio's notification center with a link to the package manager UI to address issues.
The notification will let the user know what package in what project/solution is vulnerable or its plural equivalent. i.e. Known security vulnerabilities have been detected in your project(s)/solution.

Additional Context and Details
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