feat(performance): set default trace buffer size to match DevTools (1.2gb) (#2614)

Align the trace buffer size configured during performance trace
recording with the 1.2 GB (1,200,000 KB) buffer size used by DevTools
TracingManager. This prevents traces from overflowing the default 200 MB
buffer during longer recordings.

src/tools/performance.ts

@@ -81,6 +81,7 @@ export const startTrace = definePageTool({
       ];
       await page.pptrPage.tracing.start({
         categories,
+        bufferSize: 1200 * 1000,
       });
 
       if (request.params.reload) {

tests/tools/performance.test.ts

@@ -67,6 +67,7 @@ describe('performance', () => {
             ...DevTools.TracingOptionalCategories.JsSampling,
             ...DevTools.TracingOptionalCategories.Screenshot,
           ],
+          bufferSize: 1200 * 1000,
         });
         assert.ok(context.isRunningPerformanceTrace());
         assert.ok(