TF-4193 Fix all Nitpick comments from coderabbit

lib/features/mailbox_dashboard/domain/usecases/get_all_recent_search_latest_interactor.dart

@@ -1,5 +1,3 @@
-import 'dart:core';
-
 import 'package:core/presentation/state/failure.dart';
 import 'package:core/presentation/state/success.dart';
 import 'package:core/utils/app_logger.dart';

lib/features/mailbox_dashboard/domain/usecases/save_recent_search_interactor.dart

@@ -1,5 +1,3 @@
-import 'dart:core';
-
 import 'package:core/core.dart';
 import 'package:dartz/dartz.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';