feat: add templates for debugging purposes

[mariajgrimaldi]

Description

This PR adds k8s templates for debug pods, i.e pods running with non-production setup (root user, container entrypoint/command changed, ...), which allow developers to debug services like LMS/CMS in a production-like environment.

How to test

1. Configure debugging capabilities:

# config.yml
OPENEDX_DEBUG_COOKIE: ednx_enable_debug # or anything else
DRYDOCK_DEBUG: False

2. Generate new manifests
3. Sync in argoCD
4. Increase replicas for debug services
   k scale --replicas=1 deployment/lms-debug
   or
   k scale --replicas=1 deployment/cms-debug
5. Go to the LMS/Studio page. Then, add your cookie:
   ednx_enable_debug: always
6. Check the traffic is being redirected to your debugging pod.

You can test this in yamato using any namespace defined.

[MoisesGSalas]

LGTM