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[202405] Add log ignore to account for FDB flush race condition #15798

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Commits on Nov 28, 2024

  1. Add log ignore to account for FDB flush race condition

    During fdb/test_fdb_mac_learning.py::testARPCompleted, syslog will
    output the following error log:
    
    ```
    ERR swss#orchagent: :- update: Failed to get port by bridge port ID
    0x3a00000000155c.
    ```
    
    This is not an actual error, but a minor race condition - it is
    caused by Broadcom SAI sending a FDB AGED event after the FDB entry
    has been flushed, causing orchagent to check on a bridge port that
    does not exist.
    
    Same issue as the one reoslved in
    sonic-net#9818
    justin-wong-ce committed Nov 28, 2024
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