TF-1809: Handle sync data from cache and network when get email contents

(cherry picked from commit 896059cd5b29c62c2cf34621fe35d7b23a54acf4)

lib/features/email/domain/state/get_email_content_state.dart

@@ -26,6 +26,22 @@ class GetEmailContentSuccess extends UIState {
   ];
 }
 
+class GetEmailContentFromCacheSuccess extends UIState {
+  final String emailContentString;
+  final List<Attachment> attachments;
+
+  GetEmailContentFromCacheSuccess(
+    this.emailContentString,
+    this.attachments,
+  );
+
+  @override
+  List<Object?> get props => [
+    emailContentString,
+    attachments,
+  ];
+}
+
 class GetEmailContentFailure extends FeatureFailure {
   final dynamic exception;
 

lib/features/email/domain/state/get_opened_email_from_cache_state.dart

@@ -1,22 +0,0 @@
-import 'package:core/presentation/state/failure.dart';
-import 'package:core/presentation/state/success.dart';
-import 'package:tmail_ui_user/features/email/domain/model/detailed_email.dart';
-
-class GetOpenedEmailLoading extends UIState {}
-
-class GetOpenedEmailSuccess extends UIState {
-  final DetailedEmail detailedEmail;
-
-  GetOpenedEmailSuccess(this.detailedEmail);
-
-  @override
-  List<Object?> get props => [detailedEmail];
-}
-
-class GetOpenedEmailFailure extends FeatureFailure {
-
-  GetOpenedEmailFailure(dynamic exception) : super(exception: exception);
-
-  @override
-  List<Object?> get props => [exception];
-}