add deprecation annotation to old useDraftObservation()

src/frontend/hooks/useDraftObservation.ts

@@ -15,6 +15,9 @@ import * as Sentry from '@sentry/react-native';
 // draft observation have 2 parts:
 // 1. All the information, except processed photos are saved to persisted state.
 // 2. Photos are processed (to be turned into a useable format by mapeo) async. Since promises cannot be stored in persisted storage, we hold those in a context. Once those photos are processed we save them to persisted state.
+/**
+ * @deprecated Use hooks from [draftObservation.ts](./draftObservation.ts)
+ */
 export const useDraftObservation = () => {
   const {addPhotoPromise, cancelPhotoProcessing, deletePhotoPromise} =
     usePhotoPromiseContext();