PoC: multiple nginx instances with agent

[sjberman]

As a maintainer of NGF
I want to do an early prototype of NGF integrating with NGINX Agent using multiple nginx deployments
So that I can give the Agent team feedback for integration in preparation for data and control plane separation.

Expanding on the work done in: #1679

Acceptance

• An NGF environment is created that integrates with NGINX Agent and multiple nginx deployments
• Feedback on Agent integration is relayed to the NGINX Agent team.

Dev Notes:

• N1 codebase (internal) can be used as a reference on this solution, per the comments in the existing PoC relating to this task.

[github-actions]

This issue is stale because it has been open 14 days with no activity. Remove stale label or comment or this will be closed in 14 days.