[BUGFIX] Add e2e test for file-storage multi-replica dashboard sync

test/e2e/replica-file-sync/00-assert.yaml

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+# Step 2: wait for all pods to be ready.
+apiVersion: kuttl.dev/v1beta1
+kind: TestAssert
+timeout: 300
+---
+apiVersion: perses.dev/v1alpha2
+kind: Perses
+metadata:
+  name: perses-multi-replica
+status:
+  conditions:
+    - type: Available
+      status: "True"
+      reason: Reconciled
+    - type: Degraded
+      status: "False"
+      reason: Reconciled
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: perses-multi-replica-config
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: perses-multi-replica
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: perses-multi-replica
+status:
+  readyReplicas: 3

test/e2e/replica-file-sync/00-install.yaml

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+# Step 1: Perses with file storage and replicas > 1 (separate PVC per pod).
+apiVersion: perses.dev/v1alpha2
+kind: Perses
+metadata:
+  name: perses-multi-replica
+  labels:
+    app.kubernetes.io/instance: perses-multi-replica
+spec:
+  replicas: 3
+  metadata:
+    labels:
+      instance: perses-multi-replica
+  config:
+    database:
+      file:
+        extension: yaml
+        folder: /perses
+  containerPort: 8080
+  resources:
+    requests:
+      memory: 128Mi

test/e2e/replica-file-sync/01-install.yaml

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+# Step 3: PersesDashboard synced to the Perses instance via instanceSelector.
+apiVersion: perses.dev/v1alpha2
+kind: PersesDashboard
+metadata:
+  name: multi-replica-dashboard
+spec:
+  instanceSelector:
+    matchLabels:
+      app.kubernetes.io/instance: perses-multi-replica
+  config:
+    display:
+      name: Multi Replica Dashboard
+    duration: 5m
+    panels:
+      testPanel:
+        kind: Panel
+        spec:
+          display:
+            name: Test Panel
+          plugin:
+            kind: TimeSeriesChart
+            spec: {}
+          queries:
+            - kind: TimeSeriesQuery
+              spec:
+                plugin:
+                  kind: PrometheusTimeSeriesQuery
+                  spec:
+                    query: up
+    layouts:
+      - kind: Grid
+        spec:
+          display:
+            title: Row 1
+            collapse:
+              open: true
+          items:
+            - x: 0
+              "y": 0
+              width: 24
+              height: 6
+              content:
+                "$ref": "#/spec/panels/testPanel"

test/e2e/replica-file-sync/02-assert.yaml

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+# Step 4: list dashboards on each pod (not via the Service).
+# Strict: the first poll where any replica lists the dashboard, all replicas must.
+# Step timeout is short: Kuttl retries failed asserts, so keep each run fast.
+apiVersion: kuttl.dev/v1beta1
+kind: TestAssert
+timeout: 15
+commands:
+  - script: |
+      STS=perses-multi-replica
+      DASHBOARD=multi-replica-dashboard
+      URL="/api/v1/projects/${NAMESPACE}/dashboards"
+
+      kubectl port-forward -n "$NAMESPACE" "pod/${STS}-0" 18080:8080 &
+      PF0=$!
+      kubectl port-forward -n "$NAMESPACE" "pod/${STS}-1" 18081:8080 &
+      PF1=$!
+      kubectl port-forward -n "$NAMESPACE" "pod/${STS}-2" 18082:8080 &
+      PF2=$!
+      trap 'kill $PF0 $PF1 $PF2 2>/dev/null' EXIT
+      sleep 2
+
+      HAVE=0
+      for wait in $(seq 1 20); do
+        HAVE=0
+        for PORT in 18080 18081 18082; do
+          if curl -sf --connect-timeout 2 --max-time 3 \
+            "http://localhost:${PORT}${URL}" 2>/dev/null | grep -q "$DASHBOARD"; then
+            HAVE=$((HAVE + 1))
+          fi
+        done
+        if [ "$HAVE" -gt 0 ]; then
+          break
+        fi
+        sleep 1
+      done
+
+      if [ "$HAVE" -eq 0 ]; then
+        echo "FAIL: dashboard never appeared on any replica"
+        exit 1
+      fi
+      if [ "$HAVE" -eq 3 ]; then
+        echo "Dashboard listed on all replicas"
+        exit 0
+      fi
+      echo "FAIL: dashboard on ${HAVE}/3 replicas"
+      exit 1