Xcvrd Refactor 6/13: Create handle_cmis_dp_pre_init_check_state function for CMIS_DP_PRE_INIT_CHECK

[bobby-nexthop]

Description

This change moves CMIS processing for dp pre init state into its own function. It does not add any logic changes.

Motivation and Context

xcvrd has gotten to 4000 lines long. To make things easier, we'd like to refactor it. This is the second PR in a series that aims to do the following:

Task	PR
1) Move functions used across multiple files in xcvrd to utils/common.py	#654
2) Move CmisManagerTask into cmis/cmis_manager_task.py	#691
3) Split task_worker into process_single_lport	#701
4) Move cmis logic out of process_single_lport	#716
4) Add handle_cmis_inserted_state function	#738
5) Add handle_cmis_dp_pre_init_check_state function	#741
6) Add handle_cmis_dpdeinit_state function	bobby-nexthop#6
7) Add handle_cmis_ap_conf_state function	bobby-nexthop#7
8) Add handle_cmis_dp_init_state	bobby-nexthop#8
9) Add handle_cmis_txon_state	bobby-nexthop#9
10) Add handle_cmis_activate_state	bobby-nexthop#10

How Has This Been Tested?

Transceivers continue to get programmed correctly with links up, unit tests pass

Additional Information (Optional)

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Copilot]

Pull request overview

This PR continues the xcvrd CMIS state machine refactor by extracting the CMIS_STATE_DP_PRE_INIT_CHECK logic into a dedicated helper method, without changing behavior. The state machine now delegates the datapath pre-init check handling to this new method, improving readability and maintainability.

Changes:

• Introduced handle_cmis_dp_pre_init_check_state(self, lport) to encapsulate all CMIS_STATE_DP_PRE_INIT_CHECK handling logic.
• Updated process_cmis_state_machine to call the new handler instead of inlining the datapath pre-init check logic.
• Preserved existing datapath reinit, Tx power configuration, frequency validation, and READY transition behavior via the new helper’s return value contract.

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