no issue
Previously the beta editor only worked for newly created posts/pages, any older content would open with the original editor. This change enables automatic conversion of old content to the new content format when a post/page is opened in the admin interface allowing new features like signup and advanced header cards to be used on existing content.
- removed `convertToLexical` feature flag
- where necessary switched to using just the `lexicalEditor` feature flag in its place
- moved the "L"/"M" indicators on the posts list to a new `lexicalIndicators` feature flag to make debugging/development easier
- added a redirect to the original editor route so that any route to opening the editor (such as the `/edit` front-end shortcut, or other areas of Admin) will open in the beta editor
- avoids confusing/inconsistent behavior
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