fix: add hash calculation

This sets the existingPath to go with existingName so that hash calculation happens.

See the following code for reference:

- https://github.com/open-telemetry/opentelemetry-helm-charts/blob/a3074b4a0c9839054488ff08d5daabeb5d89d522/charts/opentelemetry-collector/values.yaml#L87-L89
- https://github.com/open-telemetry/opentelemetry-helm-charts/blob/a3074b4a0c9839054488ff08d5daabeb5d89d522/charts/opentelemetry-collector/templates/_helpers.tpl#L234-L249

Author: icco

charts/agent/values.yaml

@@ -188,6 +188,7 @@ cluster-events:
   configMap:
     create: false
     existingName: "cluster-events"
+    existingPath: "cluster-events-configmap.yaml"
 
   resources:
     requests:
@@ -320,6 +321,7 @@ cluster-metrics:
   configMap:
     create: false
     existingName: "cluster-metrics"
+    existingPath: "cluster-metrics-configmap.yaml"
 
   resources:
     requests:
@@ -451,6 +453,7 @@ prometheus-scraper:
   configMap:
     create: false
     existingName: "prometheus-scraper"
+    existingPath: "prometheus-scraper-configmap.yaml"
 
   resources:
     requests:
@@ -582,6 +585,7 @@ node-logs-metrics:
   configMap:
     create: false
     existingName: "node-logs-metrics"
+    existingPath: "node-logs-metrics-configmap.yaml"
 
   resources:
     requests:
@@ -764,6 +768,7 @@ monitor:
   configMap:
     create: false
     existingName: "monitor"
+    existingPath: "agent-monitor-configmap.yaml"
 
   resources:
     requests:
@@ -894,6 +899,7 @@ forwarder:
   configMap:
     create: false
     existingName: "forwarder"
+    existingPath: "forwarder-configmap.yaml"
 
   resources:
     requests: