[Mellanox] Refactor SFP to use new APIs. (#10317)

- Why I did it
Refactor SFP code to remove code duplication and to be able to use the latest features available in new APIs.

- How I did it
Refactor SFP code to remove code duplication and to be able to use the latest features available in new APIs.

- How to verify it
Run sonic-mgmt/platform_tests/sfp tests

platform/mellanox/mlnx-platform-api/tests/test_chassis.py

@@ -166,7 +166,6 @@ class TestChassis:
     @mock.patch('sonic_platform.sfp_event.sfp_event.check_sfp_status', MagicMock())
     @mock.patch('sonic_platform.sfp_event.sfp_event.__init__', MagicMock(return_value=None))
     @mock.patch('sonic_platform.sfp_event.sfp_event.initialize', MagicMock())
-    @mock.patch('sonic_platform.sfp.SFP.reinit', MagicMock())
     @mock.patch('sonic_platform.device_data.DeviceDataManager.get_sfp_count', MagicMock(return_value=3))
     def test_change_event(self):
         from sonic_platform.sfp_event import sfp_event
@@ -185,7 +184,6 @@ class TestChassis:
         assert status is True
         assert 'sfp' in event_dict and event_dict['sfp'][1] == '1'
         assert len(chassis._sfp_list) == 3
-        assert SFP.reinit.call_count == 1
 
         # Call get_change_event with timeout=1.0
         return_port_dict = {}

platform/mellanox/mlnx-platform-api/tests/test_sfp.py

@@ -49,7 +49,7 @@ class TestSfp:
         assert sfp.sdk_index == 1
         assert sfp.index == 5
 
-    @mock.patch('sonic_platform.sfp.SFP._read_eeprom_specific_bytes', mock.MagicMock(return_value=None))
+    @mock.patch('sonic_platform.sfp.SFP.read_eeprom', mock.MagicMock(return_value=None))
     @mock.patch('sonic_platform.sfp.SFP._get_error_code')
     @mock.patch('sonic_platform.chassis.Chassis.get_num_sfps', mock.MagicMock(return_value=2))
     def test_sfp_get_error_status(self, mock_get_error_code):