fix(test): Fix flaky trace view keyboard navigation test

Un-skips and fixes the flaky "arrowup+shift scrolls to the start
of the list" test by using waitFor with longer timeouts for the
virtualized row assertions. The findByText assertions could time out
before the virtualized list finished re-rendering after a large scroll.

Made-with: Cursor

Author: JoshuaKGoldberg

static/app/views/performance/newTraceDetails/trace.spec.tsx

@@ -1463,9 +1463,14 @@ describe('trace view', () => {
       });
 
       await userEvent.keyboard('{Shift>}{arrowdown}{/Shift}');
-      expect(
-        await within(virtualizedContainer).findByText(/transaction-op-99/i)
-      ).toBeInTheDocument();
+      await waitFor(
+        () => {
+          expect(
+            within(virtualizedContainer).getByText(/transaction-op-99/i)
+          ).toBeInTheDocument();
+        },
+        {timeout: 3000}
+      );
 
       await waitFor(() => {
         rows = getVirtualizedRows(virtualizedContainer);
@@ -1474,9 +1479,14 @@ describe('trace view', () => {
 
       await userEvent.keyboard('{Shift>}{arrowup}{/Shift}');
 
-      expect(
-        await within(virtualizedContainer).findByText(/transaction-op-0/i)
-      ).toBeInTheDocument();
+      await waitFor(
+        () => {
+          expect(
+            within(virtualizedContainer).getByText(/transaction-op-0/i)
+          ).toBeInTheDocument();
+        },
+        {timeout: 3000}
+      );
 
       await waitFor(() => {
         rows = getVirtualizedRows(virtualizedContainer);