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/mysql.yaml

@@ -16,13 +16,13 @@ metadata:
 spec:
   selector:
     matchLabels:
-      app: mysql
+      app.kubernetes.io/name: mysql
   strategy:
     type: Recreate
   template:
     metadata:
       labels:
-        app: mysql
+        app.kubernetes.io/name: mysql
     spec:
       containers:
       - image: mysql:9.2.0@sha256:45f5ae20cfe1d6e6c43684dfffef17db1e1e8dc9bf7133ceaafb25c16b10f31b
@@ -46,7 +46,7 @@ apiVersion: v1
 kind: Service
 metadata:
   labels:
-    app: mysql
+    app.kubernetes.io/name: mysql
   name: mysql
 spec:
   ports:
@@ -55,6 +55,6 @@ spec:
     nodePort: 3306
     protocol: TCP
   selector:
-    app: mysql
+    app.kubernetes.io/name: mysql
   sessionAffinity: None
   type: NodePort