Set SimpleTerminalCollapsible default true for Insiders, false for Stable (#296911)

* Initial plan

* Set SimpleTerminalCollapsible default true for insiders, false for stable

Co-authored-by: justschen <54879025+justschen@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: justschen <54879025+justschen@users.noreply.github.com>

Author: Copilot

src/vs/workbench/contrib/chat/browser/chat.contribution.ts

@@ -1127,7 +1127,7 @@ configurationRegistry.registerConfiguration({
 		},
 		[ChatConfiguration.SimpleTerminalCollapsible]: {
 			type: 'boolean',
-			default: false,
+			default: typeof product.quality === 'string' && product.quality !== 'stable', // only enable as default in insiders
 			markdownDescription: nls.localize('chat.tools.terminal.simpleCollapsible', "When enabled, terminal tool calls are always displayed in a collapsible container with a simplified view."),
 			tags: ['experimental'],
 		},