[stable25] fix: reconnect - reload main container #3635
                
     Merged
            
            
          
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Introduce
hasEditoras reactive data to dynamically reload the MainContainer.$editor is not reactive.
Once the MainContainer was rendered it stayed - even when the connection expired. The child components of MainContainer would still have the old $editor value.
Fixes #3374.
🏁 Checklist
npm run lint/npm run stylelint/composer run cs:check)