Previously was disabled until any list was present (except for done) this now takes into account the welcome blank state

Closes #27931

Part of #18437 to remove jQuery UI. This removes the datepicker

Added some error handling which reverts the frontend data changes &
notifies the user

Fixed users href path being incorrect

Changed how components are added in objects

Does not remove the issue from the selected tab when it it de-selected, it instead gets purged when changing tab

Fixed scroll position being lost