Remove unrelated changes from chatSessionsProvider

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/@types/vscode.proposed.chatSessionsProvider.d.ts

@@ -95,11 +95,6 @@ declare module 'vscode' {
 		 */
 		description?: string | MarkdownString;
 
-		/**
-		 * An optional badge that provides additional context about the chat session.
-		 */
-		badge?: string | MarkdownString;
-
 		/**
 		 * An optional status indicating the current state of the session.
 		 */