[action] [PR:18797] Refactor fdb_mac_move test to use actual port numbers (sonic-net#545)

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### Description of PR
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Summary:
Refactor fdb_mac_move test to use actual port numbers from port_list for improved clarity and accuracy in ARP request handling.

### Type of change

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- e.g.
- [x] Bug fix
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- [x] 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
- [x] 202411
- [x] 202505

### Approach
#### What is the motivation for this PR?
Fix KeyError failure on fdb mac move test when trying to send arp request:
`> ptf.dataplane_instance.port_to_device = lambda port: ptf.dataplane_instance.port_device_map[port]
E KeyError: 1`

#### How did you do it?
Use actual port numbers from port_list instead of calculating indices

#### How did you verify/test it?
Ran the test

#### Any platform specific information?

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

### Documentation
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(If it's a new feature, new test case)
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Author: mssonicbld

tests/fdb/test_fdb_mac_move.py

@@ -125,8 +125,10 @@ def test_fdb_mac_move(ptfadapter, duthosts, fanouthosts, rand_one_dut_hostname,
     for loop_time in range(0, loop_times):
         port_index_start = (0 + loop_time) % len(port_list)
 
-        for (port, dummy_mac_set) in zip(list(range(len(port_list))), dummy_mac_list):
-            port_index = (port_index_start + port) % len(port_list)
+        # Use actual port numbers from port_list instead of calculating indices
+        for i in range(len(port_list)):
+            port_index = port_list[(port_index_start + i) % len(port_list)]
+            dummy_mac_set = dummy_mac_list[(port_index_start + i) % len(port_list)]
             for dummy_mac in dummy_mac_set:
                 send_arp_request(ptfadapter, port_index, dummy_mac, router_mac, vlan_id)