Ignore LAG member port enable message for down ports

[haojun291]

[teamsyncd] Ignore LAG member port 'enable' message for down ports

What I did
 Added a check for the physical port's up/down state when teamd reports member port status. This ensures that the 'enable' message for a member port is ignored if the physical port is down.

Why I did it
 On platforms using the Trident4 ASIC, there is a specific issue in the SAI (Switch Abstraction Interface). Processing an 'enable' message for a port that is physically down causes an SAI error during operations like port splitting or removing a port from a LAG. This fix prevents that error from happening.

How I verified it
 Verified on a Trident4-based physical switch. I confirmed that removing a 'down' member port from a LAG no longer triggers the SAI error.

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[mssonicbld]

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