Improve Visibility of Domain Ownership Verification Notice

### Environment information

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### Description

Related: https://github.com/aws-amplify/amplify-backend/issues/1568#issuecomment-2202549020

The Domain Ownership Verification Notice is displayed for only a few milliseconds, making it easy to miss this crucial step in configuring a custom domain with Amplify. This can lead to confusion and uncertainty about the next steps. While there is a workaround by navigating to `Actions > View DNS Records` this additional step should be unnecessary.

Potential improvements:
- Increasing the display duration, implementing a persistent notice or modal window, and providing clear next steps. This will ensure users cannot proceed without being aware of the required steps, reducing confusion and providing a smoother experience when working with custom domains in Amplify.

The issue names no files or tests; start by reproducing the custom-domain flow in Amplify Hosting and locating where the Domain Ownership Verification Notice is shown. Done means the verification requirement remains visible long enough or persists with clear next steps, without requiring users to open Actions > View DNS Records.

Written by the indexing model from the issue text.