fix(mobile): use sets in album refresh, concurrent futures (#14193)

* use sets in album sync, concurrent futures

* batch excluded asset IDs

* update test

* take advantage of sets in Recents check

* move log statement

* smaller diff

mobile/test/services/album.service_test.dart

@@ -54,6 +54,7 @@ void main() {
           .thenAnswer((_) async => []);
       when(() => backupRepository.getIdsBySelection(BackupSelection.select))
           .thenAnswer((_) async => []);
+      when(() => albumMediaRepository.getAll()).thenAnswer((_) async => []);
       when(() => albumRepository.count(local: true)).thenAnswer((_) async => 1);
       when(() => syncService.removeAllLocalAlbumsAndAssets())
           .thenAnswer((_) async => true);