[BUG] missing channel Id validation when creating notification settings

[Hailong-am]

What is the bug?

https://github.com/opensearch-project/index-management/blob/main/src/main/kotlin/org/opensearch/indexmanagement/controlcenter/notification/action/index/TransportIndexLRONConfigAction.kt#L89

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

What is the expected behavior?
A clear and concise description of what you expected to happen.

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?
If applicable, add screenshots to help explain your problem.

Do you have any additional context?
Add any other context about the problem.