Add CDB support field to get_transceiver_info

[bgallagher-nexthop]

Description

Add a key to the dictionary returned by get_transceiver_info that indicates whether the transceiver advertises CDB support.

Motivation and Context

This change will provide the following benefits:

• CDB support for an interface will be stored in STATE_DB (TRANSCEIVER_INFO table). CLI commands like show interface transceiver info can leverage that to conveniently display whether CDB is supported.
• sfputil can similarly display CDB support conveniently in sfputil show eeprom.

How Has This Been Tested?

Fixed the existing unit-test to actually exercise the underlying code and extended it to cover this PR's changes.

[mssonicbld]

/azp run

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[mssonicbld]

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[prgeor]

@bgallagher-nexthop can you check if this new field addition breaks any existing sonic-mgmt test? @mihirpat1 fyi

[mihirpat1]

@bgallagher-nexthop can you check if this new field addition breaks any existing sonic-mgmt test? @mihirpat1 fyi

@pnakka28 Can we add a testcase for this new field?

[Copilot]

Pull request overview

This PR extends the CMIS transceiver info interface in sonic-platform-common by adding a cdb_supported key to the dictionary returned by get_transceiver_info(), enabling downstream components (e.g., STATE_DB population and CLI tooling) to surface whether a module advertises CDB support.

Changes:

• Add cdb_supported to CMIS_XCVR_INFO_DEFAULT_DICT and include it in CmisApi.get_transceiver_info().
• Update CMIS unit tests to more directly exercise get_transceiver_info() and validate the new field.
• Update C-CMIS unit tests’ expected transceiver info payloads to include cdb_supported.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/sonic_xcvr/test_cmis.py	Updates get_transceiver_info() unit test inputs/expectations and adds coverage for the new cdb_supported field.
tests/sonic_xcvr/test_ccmis.py	Updates expected transceiver info structures to include cdb_supported.
sonic_platform_base/sonic_xcvr/api/public/cmis.py	Adds cdb_supported to the default dict and returns it from get_transceiver_info().

[bgallagher-nexthop]

can you check if this new field addition breaks any existing sonic-mgmt test?

@prgeor I have opened sonic-net/sonic-mgmt#26662 to fix a sonic-mgmt test that will break due to this PR's changes