PoC: multiple nginx instances with agent

[sjberman]

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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: https://github.com/nginxinc/nginx-gateway-fabric/issues/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.