chore(server): db health check (#14779)

#### PR Dependency Tree


* **PR #14779** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Added conditional init checks to service deployments and jobs to wait
for the database proxy before starting
* Exposed a new health port (9801) for the database proxy to enable
readiness probing

* **Tests**
  * Minor test reordering and formatting changes (no behavioral changes)
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/helm/affine/charts/gcloud-sql-proxy/templates/service.yaml

@@ -12,6 +12,10 @@ spec:
       targetPort: cloud-sql-proxy
       protocol: TCP
       name: cloud-sql-proxy
+    - port: 9801
+      targetPort: 9801
+      protocol: TCP
+      name: health
   selector:
     {{- include "gcloud-sql-proxy.selectorLabels" . | nindent 4 }}
 {{- end }}