message: Add a namespace_id msg
diff: @@ -311,7 +311,7 @@ impl Manifest {
  if let Some(kv_namespaces) = &self.kv_namespaces {
  for kv_namespace in kv_namespaces {
  top_level_fields.push(format!(
  - "kv-namespace {} needs namespace_id",
  + "kv-namespace {} needs a namespace_id",
  kv_namespace.binding
  ));
  }
  @@ -340,7 +340,7 @@ impl Manifest {
  if let Some(kv_namespaces) = &env.kv_namespaces {
  for kv_namespace in kv_namespaces {
  current_env_fields.push(format!(
  - "kv-namespace {} needs namespace_id",
  + "kv-namespace {} needs a namespace_id",
  kv_namespace.binding
  ));
  }
  