Resolve "Add a default `securityContext` policy"

General MR

Summary

Add default non-root security context if one is not specified.

Link to policy in upstream: https://kyverno.io/policies/other/add-default-securitycontext/add-default-securitycontext/

Relevant logs/screenshots

link to BB MR

Pod without security context is assigned default non-root context:

BB deployment successfully deployed locally:

Linked Issue

issue

Upgrade Notices

N/A

Closes #141 (closed)