Fix SR-IOV test failures on HPC/GPU SKUs with InfiniBand interfaces

[umfranci]

On SKUs with InfiniBand, RDMA interfaces (ib*) are discovered as PCI NICs, inflating VF counts beyond what ARM reports and crashing tests that assume all PCI NICs have IP addresses. Following are the Key changes made:

• Added 2 new functions - get_pci_nics_except_ib() and get_device_slots_except_ib() to filter out IB interfaces from VF/slot counts.
• Used get_pci_nics_except_ib() in check_sriov() and get_pci_nics_except_ib() in check_sriov_count() VF count validation.
• Fixed get_pci_slot_from_device_path() to return the leaf PCI device slot instead of a parent bridge.
• Used IB-excluded counts in initialize_nic_info() and sriov_basic_test() and added IB skip logic in VF connection tests.
• Skipped IB interfaces in verify_sriov_interrupts_change() to prevent crashes on NICs without IPs.
• Skipped IB interfaces in server NIC matching; fixed .is_not_none() → .is_not_empty() bug.