27.6-RC7

Changes compared to: 27.6-RC6

Non user facing:

• Fixes an unreleased bug where the Gutenberg Undo button required multiple clicks to revert the applied Content Planner outline. #23212
• Fixes an unreleased bug where the content planner inline banner's buttons could not be reached via keyboard Tab and Shift+Tab navigation and were not announced by screen readers, which was caused by the banner sitting outside Gutenberg's block wrappers. #23231
• Adds learn more link to the conten planner inline banner and refactor the learn more link in the content planner approve modal. #23231