Shell completion does not work for Zsh

[clebs]

Description
Following the instructions provided by cobra to enable completion for the kyma CLI commands does not work showing the following error:
/dev/fd/11:type:299: bad option: -t

Expected result

Completions work after running the command as explained by the output of kyma completion -h

Actual result

Error is displayed:
/dev/fd/11:type:299: bad option: -t

Steps to reproduce

1. Install Kyma CLI as explained here: https://github.com/kyma-project/cli/releases/tag/v0.7.0
2. Run . <(kyma completion), which should add the completions code to your bash session .

[suleymanakbas91]

Currently, Kyma CLI shell completion does not support Zsh. That's why you see this error. I created a PR to add support but it is blocked by this bug in cobra. As soon as the bug gets fixed (there is already an open PR), I'll merge my PR to provide support for Zsh as well.

[stale]

This issue has been automatically marked as stale due to the lack of recent activity. It will soon be closed if no further activity occurs. Thank you for your contributions.

[suleymanakbas91]

The bug seems not to be fixed in the near future. We should hard-code the completion code for zsh just like some other clients (e.g. minikube).