Copp add/remove trap not working on 7050CX3 SKUs

[veronica-arista]

Description

Copp add/remove trap currently not working on 7050CX3 SKUs. Creating this issue to track the problem and use as xfail condition in the appropriate sonic-mgmt tests.

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Additional information you deem important (e.g. issue happens only occasionally):

[veronica-arista]

tagging @prabhataravind

[zhangyanzhao]

known issue. Generic issue, not branch specific. @veronica-arista can you please help to add more details, repro steps, logs, expected result, actual result info.