[202305] Enhancement for route perf test for backend devices

[developfast]

Description of PR

Summary: cherry-pick pr for 202305 from #12460 Fixes # (issue)

Type of change

• [ ] Bug fix
• [ ] Testbed and Framework(new/improvement)
• [X] Test case(new/improvement)

Back port request

• [ ] 201911
• [ ] 202012
• [ ] 202205
• [ ] 202305
• [ ] 202311

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

[developfast]

@StormLiangMS can you pls help merge?

[developfast]

/azrun

[developfast]

/azp run

[azure-pipelines[bot]]

Commenter does not have sufficient privileges for PR 12461 in repo sonic-net/sonic-mgmt

[neethajohn]

Tested with 202305 on backend and non backend testbed and tests have passed