fix(phoenix): remove ServiceMonitor (no Prometheus Operator in cluster)

The ServiceMonitor CRD (monitoring.coreos.com) is not installed because this
cluster runs a standalone Prometheus deployment, not the Prometheus Operator.
The manifest itself noted 'only apply if Prometheus Operator is installed'.
Removing it unblocks the phoenix app sync.

phoenix/servicemonitor.yaml

@@ -1,18 +0,0 @@
-# Optional: ServiceMonitor for Prometheus Operator
-# Only apply this if you have Prometheus Operator installed
-apiVersion: monitoring.coreos.com/v1
-kind: ServiceMonitor
-metadata:
-  name: phoenix-metrics
-  namespace: phoenix
-  labels:
-    app: phoenix
-spec:
-  selector:
-    matchLabels:
-      app: phoenix
-  endpoints:
-    - port: metrics
-      path: /metrics
-      interval: 30s
-      scrapeTimeout: 10s