cert-manager: Remove unused secrets

These secrets were used by previous issuers/solvers and are no longer
needed.

cert-manager/kustomization.yaml

@@ -8,13 +8,6 @@ resources:
 - cert-exporter.yaml
 
 secretGenerator:
-- name: cert-manager-tsig
-  namespace: cert-manager
-  files:
-  - cert-manager.key
-  options:
-    disableNameSuffixHash: true
-
 - name: zerossl-eab
   namespace: cert-manager
   envs:
@@ -28,13 +21,6 @@ secretGenerator:
   - cert-exporter.pem
   - ssh_known_hosts
 
-- name: acme-dns
-  namespace: cert-manager
-  files:
-  - acme-dns.json
-  options:
-    disableNameSuffixHash: true
-
 - name: cloudflare
   namespace: cert-manager
   files: