chore(server): switch to prometheus (#12352)

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

## Summary by CodeRabbit

- **New Features**
  - Added platform-specific monitoring integration for Google Cloud Platform (GCP) in multiple services, enabling automated pod monitoring for deployments on GCP.

- **Chores**
  - Removed an unused dependency related to Google Cloud monitoring from the backend server package.

- **Refactor**
  - Updated internal monitoring implementation by removing a previously used metric reader method for GCP integration.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/helm/affine/charts/renderer/templates/monitoring.yaml

@@ -0,0 +1,12 @@
+{{- if eq .Values.global.deployment.platform "gcp" -}}
+apiVersion: monitoring.googleapis.com/v1
+kind: ClusterPodMonitoring
+metadata:
+  name: "{{ include "renderer.fullname" . }}"
+spec:
+  selector:
+    {{- include "renderer.selectorLabels" . | nindent 4 }}
+  endpoints:
+    - port: 9464
+      interval: 30s	
+{{- end }}