ACR Dashboard Subtle Notification

[benbowler]

Summary

Addresses issue:

• 9371

Relevant technical choices

WIP, handing over while I'm on vacation. Outstanding work is unchecked in the issue and includes the render logic and tests. The banner components, actions, copy, style and stories are done here.

PR Author Checklist

• [ ] My code is tested and passes existing unit tests.
• [ ] My code has an appropriate set of unit tests which all pass.
• [ ] My code is backward-compatible with WordPress 5.2 and PHP 7.4.
• [ ] My code follows the WordPress coding standards.
• [ ] My code has proper inline documentation.
• [ ] I have added a QA Brief on the issue linked above.
• [ ] I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

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Code Reviewer Checklist

• [ ] Run the code.
• [ ] Ensure the acceptance criteria are satisfied.
• [ ] Reassess the implementation with the IB.
• [ ] Ensure no unrelated changes are included.
• [ ] Ensure CI checks pass.
• [ ] Check Storybook where applicable.
• [ ] Ensure there is a QA Brief.
• [ ] Ensure there are no unexpected significant changes to file sizes.

Merge Reviewer Checklist

• [ ] Ensure the PR has the correct target branch.
• [ ] Double-check that the PR is okay to be merged.
• [ ] Ensure the corresponding issue has a ZenHub release assigned.
• [ ] Add a changelog message to the issue.