[202505] [sff-mgr] Enable sff_mgr for all non-cmis txvrs

[az-pz]

Description

Cherry pick PR for #715 .

Enable sff_mgr for all non-cmis modules.

Motivation and Context

Currently only QSFP+ and QSFP28 were supported by sff_mgr. It excluded the 10G SFP/SFP+ modules even if they had API methods required by sff_mgr. This exclusion didn't make sense since there were already checks for is_copper and get_tx_disable_support. Removed the QSFP+ and QSFP28 check. is_flat_memory check was also removed since it was not necessary.

How Has This Been Tested?

This has been tested on the following module types:

1. SFP/SFP+/SFP28
   With this change, the module is set to low power mode once it is shutdown.
   Local DOM:

MonitorData:
                RXPower: -2.596dBm
                TXBias: 0.238mA
                TXPower: -16.99dBm
                Temperature: 16.918C
                Vcc: 3.354Volts

Remote interface DOM:

  MonitorData:
                RXPower: -infdBm
                TXBias: 7.866mA
                TXPower: -2.604dBm
                Temperature: 26.797C
                Vcc: 3.349Volts

Once it's started, the local tx power and remote rx power is restored. Relevant logs are seen in the syslog as well:

2025 Nov 20 21:29:46.832609 STR43-7060x6-512-C17-U10 NOTICE pmon#xcvrd[335]: SFF-PORT-UPDATE: *** ('Ethernet512', 'CONFIG_DB', 'PORT') handle_port_update_event() fvp {'admin_status': 'down', 'alias': 'etp65', 'index': '65', 'lanes': '513', 'speed': '10000', 'subport': '0', 'port_name': 'Ethernet512', 'asic_id': 0, 'op': 'SET'}
2025 Nov 20 21:29:46.853731 STR43-7060x6-512-C17-U10 NOTICE pmon#xcvrd[335]: SFF-MAIN: Ethernet512: xcvr=present(inserted=False), host_tx_ready=true(changed=False), admin_status=down(changed=True)
2025 Nov 20 21:29:46.861393 STR43-7060x6-512-C17-U10 NOTICE pmon#xcvrd[335]: SFF-MAIN: Ethernet512: TX was disabled with lanes mask: 0b1
2025 Nov 20 21:29:46.867028 STR43-7060x6-512-C17-U10 NOTICE pmon#xcvrd[335]: SFF-PORT-UPDATE: *** ('Ethernet512', 'STATE_DB', 'PORT_TABLE') handle_port_update_event() fvp {'host_tx_ready': 'false', 'index': '-1', 'port_name': 'Ethernet512', 'asic_id': 0, 'op': 'SET'}
2025 Nov 20 21:29:46.884154 STR43-7060x6-512-C17-U10 NOTICE pmon#xcvrd[335]: SFF-MAIN: Ethernet512: xcvr=present(inserted=False), host_tx_ready=false(changed=True), admin_status=down(changed=False)
2025 Nov 20 21:29:46.889654 STR43-7060x6-512-C17-U10 NOTICE pmon#xcvrd[335]: SFF-MAIN: Ethernet512: No change is needed for tx_disable value

2. 100G QSFP28 or later copper
   sff_mgr skipped the module since it's a copper one.

Additional Information (Optional)

ADO: 35811655

[mssonicbld]

/azp run

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