Adding support for PFCWD cases for pfcQueueGroupSize of 4

[selldinesh]

Description of PR

Summary: Adding support for PFCWD cases for pfcQueueGroupSize of 4 Fixes # (issue)

Type of change

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

Back port request

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

Approach

What is the motivation for this PR?

This PR supports pfcQueueGroupSize of 4 for pfcwd cases , currently the support is for 8

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