Events output go-template fails if a builtin function is used

[zerodayace]

What happened:

Validation of events monitoring failed with output set to go-template and a template that contains a builtin function.

What you expected to happen:

Output formatted with the template.

How to reproduce it (as minimally and precisely as possible):

crictl events -o go-template "{{ . | json }}"

Anything else we need to know?:

The reason for the issue is that the validation function does not include the builtin template functions in the validation step, but the final render function does.

I fixed it and provide a PR

Environment:

Version: v1.31.1