chore: update labels to use app.kubernetes.io/name format

Refactor Kubernetes resource labels for rabbitmq, mysql, and postgres 
to follow the standardized naming convention of 
app.kubernetes.io/name. This change enhances clarity and conformity 
across resources, improving maintainability and alignment with 
Kubernetes best practices.

kind/rabbitmq.yaml

@@ -26,14 +26,14 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:
-    app: rabbitmq
+    app.kubernetes.io/name: rabbitmq
     release: rabbitmq
   name: rabbitmq
 spec:
   replicas: 1
   selector:
     matchLabels:
-      app: rabbitmq
+      app.kubernetes.io/name: rabbitmq
   strategy:
     rollingUpdate:
       maxSurge: 1
@@ -42,7 +42,7 @@ spec:
   template:
     metadata:
       labels:
-        app: rabbitmq
+        app.kubernetes.io/name: rabbitmq
     spec:
       securityContext:
         fsGroup: 999
@@ -134,7 +134,7 @@ apiVersion: v1
 kind: Service
 metadata:
   labels:
-    app: rabbitmq
+    app.kubernetes.io/name: rabbitmq
     release: rabbitmq
   name: rabbitmq
 spec:
@@ -161,6 +161,6 @@ spec:
     protocol: TCP
     targetPort: stats
   selector:
-    app: rabbitmq
+    app.kubernetes.io/name: rabbitmq
   sessionAffinity: None
   type: NodePort