Allow changing the layout of an existing section in Layout Builder UI

(cherry picked from commit bf5c669e)

Closes #3134371

added 1 commit

• 60a9f52f - fix phpstan error

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added 35 commits

• 60a9f52f...b20ec518 - 22 commits from branch project:11.x
• b20ec518...1ce72720 - 3 earlier commits
• c2036424 - Add a wrapper for the links so we can use ::after for styling.
• b1ad570f - Run prettier on our js.
• b97723a2 - Fix selector-not-notation
• afdfdb4d - Added aria labels for the admin links groups.
• ecd70a36 - Added some basic testing. Still pending testing the mappings form
• a62210db - Avoid off-canvas styling reset.
• e611fe33 - Consistent js with other methods
• b6c81f82 - Removed mapper UI + Added a base class
• 0a43257a - fix phpstan error
• 896259a1 - Fix

Compare with previous version