🐛 Fix cronjob tutorial project issues

[brightzheng100]

(:bug:): Fix cronjob tutorial project issues

• disabling webhook by ENABLE_WEBHOOKS=false won't help as the code is duplicated
• as of now, we still have to apply the workaround to make sure CRDs generated is valid and installable, see CronJob make install failed. #1466 (comment).

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[k8s-ci-robot]

Hi @brightzheng100. Thanks for your PR.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: brightzheng100
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[camilamacedo86]

Hi @brightzheng100,

I am closing this one because I understand that it is no longer an issue in the master branch since it was generated with the latest plugin version. However, please feel free to ping me if you see any issue and if you think that this change still required for we re-open this one with you are unable to do it by yourself.