Migrate to Kubernetes NetworkPolicies

[jujaga]

Description

This PR converts NSP rules to NP rules and updates the respective documentation for it.

SHOWCASE-1931

Types of changes

New feature (non-breaking change which adds functionality) Documentation (non-breaking change with enhancements to documentation) Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have checked that unit tests pass locally with my changes
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation (if appropriate)

Further comments

[ghost]

PR Deployed at: https://getok-dev.apps.silver.devops.gov.bc.ca/pr-258