test: Adjust long task integration test ui span check (#6754)

Make the check in `should capture long task` integration test check for
any number of ui spans instead of just one. In some situations in CI,
there can be multiple long tasks instead of one (due to environmental
conditions), so assert just to make sure they exist (and they are being
recorded).

Author: AbhiPrasad

packages/integration-tests/suites/tracing/browsertracing/long-tasks-enabled/test.ts

@@ -18,7 +18,7 @@ sentryTest('should capture long task.', async ({ browserName, getLocalTestPath,
   const eventData = await getFirstSentryEnvelopeRequest<Event>(page, url);
   const uiSpans = eventData.spans?.filter(({ op }) => op?.startsWith('ui'));
 
-  expect(uiSpans?.length).toBe(1);
+  expect(uiSpans?.length).toBeGreaterThan(0);
 
   const [firstUISpan] = uiSpans || [];
   expect(firstUISpan).toEqual(