Chore(benchmark): Reduce server keep-alive delay in benchmark table script

Chore(benchmark): Reduce server keep-alive delay in benchmark table script

This commit updates the `run_benchmark_table.py` script to shorten the keep-alive duration for web servers (FastAPI and Flask) after their respective benchmark tests complete and their pages are opened in the browser.

Previously, the script would pause for 5 seconds to allow manual viewing of the opened page. This duration has been reduced to 2 seconds.

Specific changes:
- Modified the `time.sleep()` call from `time.sleep(5)` to `time.sleep(2)` within the main scenario loop.
- Updated the corresponding console message `console.print(f"[blue]Keeping server alive for ... seconds to view the page...[/blue]")` to reflect the new 2-second delay.

This change streamlines the benchmark execution process by reducing the waiting period, making the overall benchmarking cycle faster, while still allowing a brief moment to visually confirm the server's response. This refinement is part of ongoing efforts to optimize the benchmarking utilities.