[Fix] Adding dut counter verification for PFC Oversubscription cases

[selldinesh]

Description of PR

Summary: Adding dut counter verification for PFC Oversubscription cases Fixes # (issue) https://github.com/sonic-net/sonic-mgmt/issues/13596

Type of change

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

Back port request

• [ ] 202012
• [ ] 202205
• [ ] 202305
• [ ] 202311
• [ ] 202405

Approach

Dependency

https://github.com/sonic-net/sonic-mgmt/pull/13848

What is the motivation for this PR?

Verifies the packet drops from the dut interface counters

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