Purge grafana dashboard json from this project

[yashvardhan-kukreja]

Software version numbers
State the version numbers of applications involved in the bug.

• Kubernetes version:
• Kubernetes platform (if applicable; ex., EKS, GKE, OpenShift):
• Kyverno version:

Describe the bug
The grafana dashboard json is meant to be in https://github.com/kyverno/grafana-dashboard.
Hence, it shouldn't be put here.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Additional context
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[yashvardhan-kukreja]

/assign