[FIX] Configure webhook notification at task level

[riccamini]

Is your feature request related to a problem? Please describe.
it should be possible to configure a webhook notification at task level as it is currently possible for email notifications. Looks like WorkflowWebhookNotifications is missing from task settings.

Cloud Information

• AWS
• Azure
• GCP
• Other

Describe the solution you'd like
WorkflowWebhookNotifications to be added to TaskSettings in engine.task. We can see that email notifications are there while webhook ones are missing:

@dataclass(frozen=True)
class TaskSettings:
    email_notifications: Optional[EmailNotifications] = None
    notification_settings: Optional[TaskNotificationSettings] = None
    timeout_seconds: Optional[int] = None
    max_retries: Optional[int] = None
    min_retry_interval_millis: Optional[int] = None
    retry_on_timeout: Optional[bool] = None
    run_if: Optional[TaskRunCondition] = None

Describe alternatives you've considered

[muhammadwaqas0505]

Assisgning to myself