Feat: add notification for change email completed (#22812)

Co-authored-by: Yansong Zhang <916125788@qq.com>

api/services/account_service.py

@@ -54,7 +54,10 @@ from services.errors.workspace import WorkSpaceNotAllowedCreateError, Workspaces
 from services.feature_service import FeatureService
 from tasks.delete_account_task import delete_account_task
 from tasks.mail_account_deletion_task import send_account_deletion_verification_code
-from tasks.mail_change_mail_task import send_change_mail_task
+from tasks.mail_change_mail_task import (
+    send_change_mail_completed_notification_task,
+    send_change_mail_task,
+)
 from tasks.mail_email_code_login import send_email_code_login_mail_task
 from tasks.mail_invite_member_task import send_invite_member_mail_task
 from tasks.mail_owner_transfer_task import (
@@ -461,6 +464,22 @@ class AccountService:
         cls.change_email_rate_limiter.increment_rate_limit(account_email)
         return token
 
+    @classmethod
+    def send_change_email_completed_notify_email(
+        cls,
+        account: Optional[Account] = None,
+        email: Optional[str] = None,
+        language: Optional[str] = "en-US",
+    ):
+        account_email = account.email if account else email
+        if account_email is None:
+            raise ValueError("Email must be provided.")
+
+        send_change_mail_completed_notification_task.delay(
+            language=language,
+            to=account_email,
+        )
+
     @classmethod
     def send_owner_transfer_email(
         cls,