Update issue templates

.github/ISSUE_TEMPLATE/sample-policy.md

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+---
+name: Sample Policy
+about: Suggest a policy that you would like Kyverno to support.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--  Please use this template to describe a new policy that you would like Kyverno to support-->
+
+**Checklist**
+
+<!-- Put an `x` in the boxes that apply to indicate you have done these things. -->
+
+- [x] I have verified the policy does not exist in the [samples library](https://kyverno.io/policies/).
+
+**Is your policy request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is.
+
+**Describe the ideal solution you'd like**
+
+A clear and concise description of what you want to happen.
+
+**Additional context**
+
+Add any other context or screenshots about the feature request here.