Show a Visual Studio notification when a vulnerability is detected

[JonDouglas]

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

No response

[JonDouglas]

@martinrrm can we close this as done or dupe of the solution explorer infobar?

[martinrrm]

Closing in favor of #12398, we will continue exploring other ways to show notifications using VS mechanisms.

[nkolev92]

Reopening to change the closing status as not planned