Added a test case for CmdAdd in CNI plugin

[biswajit-9776]

Please provide a description of this PR:

For issue #49228

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[istio-policy-bot]

😊 Welcome @biswajit-9776! This is either your first contribution to the Istio istio repo, or it's been a while since you've been here.

You can learn more about the Istio working groups, Code of Conduct, and contribution guidelines by referring to Contributing to Istio.

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[istio-testing]

Hi @biswajit-9776. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[istio-policy-bot]

🚧 This issue or pull request has been closed due to not having had activity from an Istio team member since 2024-02-23. If you feel this issue or pull request deserves attention, please reopen the issue. Please see this wiki page for more information. Thank you for your contributions.

Created by the issue and PR lifecycle manager.