debug: use inline decoration to remove token colors in HC theme

fixes #28219

src/vs/workbench/parts/debug/browser/debugEditorModelManager.ts

@@ -361,12 +361,14 @@ export class DebugEditorModelManager implements IWorkbenchContribution {
 
 	private static TOP_STACK_FRAME_DECORATION: IModelDecorationOptions = {
 		isWholeLine: true,
+		inlineClassName: 'debug-remove-token-colors',
 		className: 'debug-top-stack-frame-line',
 		stickiness
 	};
 
 	private static TOP_STACK_FRAME_EXCEPTION_DECORATION: IModelDecorationOptions = {
 		isWholeLine: true,
+		inlineClassName: 'debug-remove-token-colors',
 		className: 'debug-top-stack-frame-exception-line',
 		stickiness
 	};
@@ -377,6 +379,7 @@ export class DebugEditorModelManager implements IWorkbenchContribution {
 
 	private static FOCUSED_STACK_FRAME_DECORATION: IModelDecorationOptions = {
 		isWholeLine: true,
+		inlineClassName: 'debug-remove-token-colors',
 		className: 'debug-focused-stack-frame-line',
 		stickiness
 	};

src/vs/workbench/parts/debug/browser/media/debug.contribution.css

@@ -255,6 +255,9 @@
 }
 
 .hc-black .monaco-editor .debug-top-stack-frame-line {
-	background: rgba(255, 246, 0, .8);
-	mix-blend-mode: lighten; /* Preserves text selection's contrast */
-}
\ No newline at end of file
+	background: rgba(255, 246, 0, 1);
+}
+
+.hc-black .monaco-editor .debug-remove-token-colors {
+	color:black;
+}