[action] [PR:21500] [SNAPPI] pretty print tgen stats

[mssonicbld]

Summary: Pretty print tgen stats
Fixes # (issue)

Type of change

Old output

01/12/2025 12:45:10 traffic_generation.run_traffic L0673 INFO | Polling TGEN for in-flight traffic statistics...
01/12/2025 12:45:12 traffic_generation.run_traffic L0678 INFO | In-flight traffic statistics for flows: ['Test Flow 1 -> 0', 'Test Flow 2 -> 0', 'Background Flow 1 -> 0', 'Background Flow 2 -> 0']
01/12/2025 12:45:12 traffic_generation.run_traffic L0679 INFO | In-flight TX frames: [84570230, 84570229, 68054948, 68054950]
01/12/2025 12:45:12 traffic_generation.run_traffic L0680 INFO | In-flight RX frames: [72905510, 72905511, 68045129, 68045130]

New Ouptput

In-flight traffic statistics for flows: 
+----------------------------------+----------+----------+
| Flow | Tx | Rx |
|----------------------------------+----------+----------|
| Test Flow 1 -> 0 Rate:20 | 47691372 | 47683158 |
| Test Flow 2 -> 0 Rate:10 | 28004333 | 28004316 |
| 1 Background Flow 1 -> 0 Rate:20 | 56008665 | 51089091 |
| 2 Background Flow 2 -> 0 Rate:20 | 56008666 | 51089091 |
| 3 Background Flow 1 -> 0 Rate:20 | 56008664 | 51089091 |
| 4 Background Flow 2 -> 0 Rate:20 | 56008666 | 51089090 |
+----------------------------------+----------+----------+

• Bug fix
• Testbed and Framework(new/improvement)
• New Test case
• Skipped for non-supported platforms
• Test case improvement

Back port request

• 202205
• 202305
• 202311
• 202405
• 202411
• 202505
• 202511

Approach

What is the motivation for this PR?

How did you do it?

How did you verify/test it?

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[mssonicbld]

Original PR: #21500

[mssonicbld]

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