[Smartswitch] Fix time format for dpu states

[gpunathilell]

Description

Currently the time format being updated by the DPU and Switch are not aligned, this PR takes the common format from the HLD for all 3 states - midplane state, controlplane state and dataplane state
This also fixes the issue where the local time was represented incorrectly as UTC time

Motivation and Context

Current format:

Name    Oper-Status     State-Detail             State-Value    Time                             Reason
------  --------------  -----------------------  -------------  -------------------------------  --------
DPU0    Partial Online  dpu_midplane_link_state  up             Wed Jan 15 12:17:44 PM UTC 2025
                        dpu_control_plane_state  up             2024-11-25 04:32:45
                        dpu_data_plane_state     down           2024-11-25 04:32:45

After fix:

Name    Oper-Status     State-Detail             State-Value    Time                             Reason
------  --------------  -----------------------  -------------  -------------------------------  --------
DPU0    Partial Online  dpu_midplane_link_state  up             Wed Jan 15 12:17:44 PM UTC 2025
                        dpu_control_plane_state  up             Wed Jan 15 12:09:44 PM UTC 2025
                        dpu_data_plane_state     down           Wed Jan 15 12:09:44 PM UTC 2025

How Has This Been Tested?

Additional Information (Optional)

[mssonicbld]

/azp run

[azure-pipelines]

Pull request is closed

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[gpunathilell]

@rameshraghupathy @vvolam
Please review

[vvolam]

@gpunathilell Looks good to me.

Can we have a test case where we can check the time format for all states is same UTC?

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[gpunathilell]

@gpunathilell Looks good to me.

Can we have a test case where we can check the time format for all states is same UTC?

@vvolam Added tests

[vvolam]

LGTM!

[rameshraghupathy]

LGTM