jenkins: Remove Argo CD sync hook

Since Jenkins no longer uses a Longhorn volume, this sync hook is not
useful.

jenkins/argocd-sync-hook.yaml

@@ -1,25 +0,0 @@
-apiVersion: batch/v1
-kind: Job
-metadata:
-  name: jenkins-snapshot-hook
-  namespace: jenkins
-  annotations:
-    argocd.argoproj.io/hook: PreSync
-    argocd.argoproj.io/hook-delete-policy: BeforeHookCreation
-spec:
-  template:
-    metadata:
-      labels:
-        app.kubernetes.io/name: jenkins-snapshot-hook
-    spec:
-      containers:
-      - name: jenkins-snapshot
-        image: docker.io/curlimages/curl
-        command:
-        - curl
-        - http://longhorn-frontend.longhorn-system/v1/volumes/pvc-4d42f4d3-2f9d-4edd-b82c-b51a385a3276?action=snapshotCreate
-        - -H
-        - 'Content-Type: application/json'
-        - -d
-        - '{}'
-      restartPolicy: Never

jenkins/kustomization.yaml

@@ -7,7 +7,6 @@ labels:
 
 resources:
 - jenkins.yaml
-- argocd-sync-hook.yaml
 - secrets.yaml
 - iscsi.yaml