Fix Helm chart to respect nats.enabled flag

[casualjim]

I have my own nats cluster and I tried to disable nats in the chart but it would still deploy a nats cluster.

These changes were made by copilot so I understand if you don't want that.

NATS resources (Deployment, Service, ServiceAccount) were deployed regardless of the nats.enabled setting in values.yaml.

Changes

• Wrap templates/nats/deployment.yaml with {{- if .Values.nats.enabled }}
• Wrap templates/nats/service.yaml with {{- if .Values.nats.enabled }}
• Update templates/nats/serviceaccount.yaml condition to check both nats.enabled and serviceAccount.create

Verification

# With nats.enabled=false, no NATS resources rendered
helm template test . --set nats.enabled=false | grep "name: nats"
# (empty output)

# Default behavior unchanged
helm template test . | grep "name: nats"
# name: nats (deployment, service, serviceaccount all present)

[lxfontes]

thank you!