Add rollback-safe NPM certificate create

dns_sync/npm_client.py

@@ -372,6 +372,21 @@ class NpmClient:
             f"Unsupported NPM certificate provider: {provider!r}"
         )
 
+    def delete_certificate(
+        self,
+        local_id: str | int,
+    ) -> None:
+        certificate_id = self._local_id(
+            local_id,
+            "certificate",
+        )
+
+        self.request(
+            "DELETE",
+            f"/nginx/certificates/{certificate_id}",
+            expected_status=200,
+        )
+
     def create_certificate(
         self,
         payload: dict[str, Any],