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

```ts
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.