Feature description

Work is underway on a new effort to create a standalone Stories plugin (see #4172), we need to sunset the AMP Stories editor in the AMP plugin. As part of this, we need to notify users as soon as possible that they need to backup or export stories they have created since they are not likely to be automatically migrated to the new standalone plugin.

This notice would only appear for users who (1) have the Stories experience enabled and (2) have existing amp_story posts created. For other users, the experiences would be hidden in favor of a single notice on the AMP settings screen per #4201.

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Acceptance criteria

Implementation brief

QA testing instructions

Demo

Changelog entry