Remove unused Let's Encrypt ClusterIssuer configurations from yc-ecp cert-manager directory.

infrastructure/cert-manager/yc-ecp/clusterissuer-letsencrypt-delete.yaml

@@ -1,5 +0,0 @@
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-issuer
-$patch: delete

infrastructure/cert-manager/yc-ecp/clusterissuer-letsencrypt-istio-delete.yaml

@@ -1,5 +0,0 @@
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-issuer-istio
-$patch: delete

infrastructure/cert-manager/yc-ecp/clusterissuer-letsencrypt-prod.yaml

@@ -1,18 +0,0 @@
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-prod
-spec:
-  acme:
-    email: "sarex@sarex.io"
-    privateKeySecretRef:
-      name: letsencrypt-prod
-    server: "https://acme-v02.api.letsencrypt.org/directory"
-    solvers:
-      - http01:
-          ingress:
-            class: istio
-            podTemplate:
-              spec:
-                imagePullSecrets:
-                  - name: dockerhub