feat(content_management): add data update event to EditSourceBloc

- Implement EditSourceDataUpdated event to update BLoC with latest shared data
- Add handler for EditSourceDataUpdated event in EditSourceBloc
- Update state with new countries and languages data when event is triggered

Author: fulleni

lib/content_management/bloc/edit_source/edit_source_bloc.dart

@@ -32,6 +32,7 @@ class EditSourceBloc extends Bloc<EditSourceEvent, EditSourceState> {
     on<EditSourceHeadquartersChanged>(_onHeadquartersChanged);
     on<EditSourceStatusChanged>(_onStatusChanged);
     on<EditSourceSubmitted>(_onSubmitted);
+    on<EditSourceDataUpdated>(_onDataUpdated);
   }
 
   final DataRepository<Source> _sourcesRepository;
@@ -195,4 +196,11 @@ class EditSourceBloc extends Bloc<EditSourceEvent, EditSourceState> {
       );
     }
   }
+
+  void _onDataUpdated(
+    EditSourceDataUpdated event,
+    Emitter<EditSourceState> emit,
+  ) {
+    emit(state.copyWith(countries: event.countries, languages: event.languages));
+  }
 }

lib/content_management/bloc/edit_source/edit_source_event.dart

@@ -86,3 +86,17 @@ final class EditSourceStatusChanged extends EditSourceEvent {
 final class EditSourceSubmitted extends EditSourceEvent {
   const EditSourceSubmitted();
 }
+
+/// Event to update the BLoC with the latest shared data.
+final class EditSourceDataUpdated extends EditSourceEvent {
+  const EditSourceDataUpdated({
+    required this.countries,
+    required this.languages,
+  });
+
+  final List<Country> countries;
+  final List<Language> languages;
+
+  @override
+  List<Object?> get props => [countries, languages];
+}