[Resource Type] - [Enhancement] - Enable AWS Health notifications via CloudFormation

### Name of the resource

Other

### Resource name

AWS Notifications

### Description

Hello Team,

Requesting a feature where users can enable the AWS Health notifications and enable/disable default subscription using CloudFormation and also using the same. Currently it is not possible with CloudFormation [1].

Reference:
[1] Enabling or disabling AWS managed notifications for AWS Health
https://docs.aws.amazon.com/notifications/latest/userguide/managing-notification-features.html

### Other Details

_No response_

Start with the linked AWS documentation on enabling or disabling AWS managed notifications for AWS Health and investigate the CloudFormation coverage needed for AWS Notifications. Done means users can enable or disable the default subscription through CloudFormation, with the required resource behavior documented and validated.

Written by the indexing model from the issue text.