Stack Trace Explorer - Change color for text that is unlinked (#81306)

Changed from Excluded Code to Comment. Could also be Text, but that
coincides with some of the text in the stack trace so it may look
confusing.
<img width="1695" height="487" alt="image"
src="https://github.com/user-attachments/assets/c058ff97-e621-4350-a568-1f0104573005"
/>
versus
<img width="1715" height="502" alt="image"
src="https://github.com/user-attachments/assets/40f5c543-8502-4f66-a0b1-3e0c424fc557"
/>

Author: akhera99

src/VisualStudio/Core/Def/StackTraceExplorer/IgnoredFrameViewModel.cs

@@ -25,7 +25,7 @@ public IgnoredFrameViewModel(IgnoredFrame frame, IClassificationFormatMap format
 
     protected override IEnumerable<Inline> CreateInlines()
     {
-        var run = MakeClassifiedRun(ClassificationTypeNames.ExcludedCode, _frame.ToString());
+        var run = MakeClassifiedRun(ClassificationTypeNames.Comment, _frame.ToString());
         yield return run;
     }
 }