Refine NewsSite workload test step scenarios

[lingyuncai]

Currently, the test steps for NewsSite involve toggling the drop-down button 25*2 times to keep the testing duration measurable. However, this repetitive action does not accurately reflect real use cases.

Since NewsSite serves as a navigation workload, could we modify the test steps to navigate to a new tab instead of repeatedly toggling the drop-down menu? A potential proof of concept for this change is illustrated in #454.

With this adjustment, the NewsSite-Next trace is shown below.

Another possible option is to make the drop-down menu layout more complex to extend its execution time, eliminating the need for the loop. However, this would require more significant modifications to the site structure.

Your insights on this issue would be greatly appreciated. Thank you!