Check for and document drift for Kyverno/kyverno policies chart from upstream

Feature Request

Why

There are number of custom changes that differ from upstream. When using kpt update or other renovate checks, merge conflicts arise and can create issues. Additionally, upgrades and renovates have issues that are difficult to troubleshoot if there are many changes such as a major version change.

Proposed Solution

Pull down a copy of the upstream chart at the same version as ours and diff them.

• Move any missing changes over and/or update the DEVELOPMENT_MAINTENANCE.md documentation to specify changes that are intentionally omitted (if they are not already specified).