Analyzers show "Roslyn" in the messaging, confusing new users

[timheuer]

From vscode-dotnettools created by timheuer: microsoft/vscode-dotnettools#511

Describe the Issue

When an analyzer shows in the editor surface it says "Roslyn" next to the message code:

To new users for .NET this is confusing as this is not a term we put in front of any of our learning materials. In contrast, Visual Studio does not surface this:

Steps To Reproduce

Triggers something with an analyzer:
int[] myNumbers = new[] {1,2,3];

Expected Behavior

Unfamiliar terms with no definition shouldn't be shown and suppressed.

Recommendation: if this is a 'user agent' type string we should consider a different name ("C#?" or just remove Roslyn from this view

Environment Information

No response

[dibarbet]

Fix in dotnet/roslyn#69939