Mutators/Realm issues with decorator that check the list of registered items in the map

[timotheeguerin]

export const $armProviderNamespace: ArmProviderNamespaceDecorator = (
  context: DecoratorContext,
  entity: Namespace,
  armProviderNamespace?: string,
) => {
  const { program } = context;

  const override = isArmNamespaceOverride(program, entity);
  const namespaceCount = program.stateMap(ArmStateKeys.armProviderNamespaces).size;
  if (namespaceCount > 0 && !override) {
    reportDiagnostic(program, {
      code: "single-arm-provider",
      target: context.decoratorTarget,
    });
    return;
  }

}

with a decorator like that when it runs again in the mutated subgraph it will fail because it already finds one, the decorator doesn't take into account the current realm.