Addresses https://github.com/coder/nexus/issues/195. Specifically, just
the "tracking templates" requirement:
> ## Tracking in templates
> To enable resource alerts, a user must add the resource_monitoring
block to a template's coder_agent resource. We'd like to track if
customers have any resource monitoring enabled on a per-deployment
basis. Even better, we could identify which templates are using resource
monitoring.