feat: add bulk external observation mapping

apps/api/app/community_review.py

@@ -21,7 +21,7 @@ class ExternalReviewError(ValueError):
 
 def map_observation(
     session: Session, observation: ExternalObservation, fish: Fish, waterbody: Waterbody,
-    *, note: str | None = None,
+    *, note: str | None = None, commit: bool = True,
 ) -> ExternalObservation:
     if observation.status == "published":
         raise ExternalReviewError("published observation cannot be remapped")
@@ -43,7 +43,8 @@ def map_observation(
     observation.status = "ready" if _complete(observation) else "mapped"
     _save_alias(session, observation, "fish", observation.fish_external_id or observation.fish_name, fish=fish)
     _save_alias(session, observation, "waterbody", observation.waterbody_external_id or observation.waterbody_name, waterbody=waterbody)
-    session.commit()
+    if commit:
+        session.commit()
     return observation