REFACTOR(argocd): merge image-updater into argocd

- Move image-updater Application to argocd folder
- Move helm-values and secrets to argocd
- Remove separate argocd-image-updater folder
- Update kustomization references

argocd/image-updater-values.yaml

@@ -0,0 +1,19 @@
+# ArgoCD Image Updater Helm Values
+
+# Configuration for Zot private registry
+config:
+  logLevel: debug
+  registries:
+    - name: zot
+      prefix: zot0213.kro.kr
+      api_url: https://zot0213.kro.kr
+      credentials: pullsecret:argocd/zot-registry-credentials
+      insecure: false
+
+# Resource limits
+resources:
+  requests:
+    cpu: 15m
+    memory: 100Mi
+  limits:
+    memory: 100Mi