Created some example about policygentemplate, and tested the policy can not be deleted in migration.
https://github.com/ldpliu/cnf-features-deploy/tree/ztp-global-test/ztp/gitops-subscriptions/argocd/globalhub

We should check:

• Policy could be created using policygentemplate
• Policy created resources(operator,configmap/...) will not be impact in migration. Operator created pod can not restart

Policy migration should config follow doc: https://github.com/stolostron/multicluster-global-hub/pull/2161/files 

{}Development Complete{}

• [ ] The code is complete.
• [ ] Functionality is working.
• [ ] Any required downstream Docker file changes are made.

{}Tests Automated{}

• [ ] Unit/function tests have been automated and incorporated into the build.
• [ ] 100% automated unit/function test coverage for new or changed APIs.

{}Secure Design{}

• [ ] Security has been assessed and incorporated into your threat model.

{}Multidisciplinary Teams Readiness{}

• [ ] Create an informative documentation issue using the Customer Portal Doc template that you can access from [The Playbook](https://docs.google.com/document/d/1YTqpZRH54Bnn4WJ2nZmjaCoiRtqmrc2w6DdQxe_yLZ8/edit#heading=h.9fvyr2rdriby), and ensure doc acceptance criteria is met.

Call out this sentence as it's own action:

• [ ] Link the development issue to the doc issue.

{}Support Readiness{}

• [ ] The must-gather script has been updated.

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