chat: make codeblock editors simple widgets (#308896)

Mark chat codeblock and diff editor pools as simple widgets so their
text models are not synced to the extension host. This was the original
behavior before #204780 experimentally changed it.

The tool editor pool was already marked as simple.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: roblourens

src/vs/workbench/contrib/chat/browser/widget/chatListRenderer.ts

@@ -264,9 +264,9 @@ export class ChatListItemRenderer extends Disposable implements ITreeRenderer<Ch
 
 		this.chatContentMarkdownRenderer = this.instantiationService.createInstance(ChatContentMarkdownRenderer);
 		this.markdownDecorationsRenderer = this.instantiationService.createInstance(ChatMarkdownDecorationsRenderer);
-		this._editorPool = this._register(this.instantiationService.createInstance(EditorPool, editorOptions, delegate, overflowWidgetsDomNode, false));
+		this._editorPool = this._register(this.instantiationService.createInstance(EditorPool, editorOptions, delegate, overflowWidgetsDomNode, true));
 		this._toolEditorPool = this._register(this.instantiationService.createInstance(EditorPool, editorOptions, delegate, overflowWidgetsDomNode, true));
-		this._diffEditorPool = this._register(this.instantiationService.createInstance(DiffEditorPool, editorOptions, delegate, overflowWidgetsDomNode, false));
+		this._diffEditorPool = this._register(this.instantiationService.createInstance(DiffEditorPool, editorOptions, delegate, overflowWidgetsDomNode, true));
 		this._treePool = this._register(this.instantiationService.createInstance(TreePool, this._onDidChangeVisibility.event));
 		this._contentReferencesListPool = this._register(this.instantiationService.createInstance(CollapsibleListPool, this._onDidChangeVisibility.event, undefined, undefined));