[BUG] Invalid variables

[chipzoller]

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

• Kubernetes version: 1.21
• Kubernetes platform (if applicable; ex., EKS, GKE, OpenShift): K3d
• Kyverno version: 1.5.1

Describe the bug
Kyverno prints an invalid variable method when attempting to create a ClusterPolicy which uses the foreach validation functionality with a context referring to an API call.

EDIT: It also fails similarly for non foreach policies.

To Reproduce
Steps to reproduce the behavior:

1. See message and thread here.

Expected behavior
Kyverno allows the ClusterPolicy to be created.

cc @JimBugwadia (per contributors' call on 10/28/21, adding initial milestone for patch)

[chipzoller]

Another user failure noted in this Slack conversation.