task: #3623843 Remove Backbone.js and Underscore.js, not used in core anymore

JavaScript

  Backbone - Copyright (c) 2010 Jeremy Ashkenas and DocumentCloud

  CKEditor5 - Copyright (c) 2003 CKSource Holding sp. z o.o.

  Floating UI - Copyright (c) 2021 Floating UI contributors

  tua-body-scroll-lock Copyright (c) 2018 Evinma, StEve Young

  Underscore.js - Copyright (c) 2009 Jeremy Ashkenas, Julian Gonggrijp, and

   DocumentCloud and Investigative Reporters & Editors

CSS

  Normalize.css - Copyright (c) Nicolas Gallagher and Jonathan Neal

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//     Underscore.js 1.13.8

//     https://underscorejs.org

//     (c) 2009-2026 Jeremy Ashkenas, Julian Gonggrijp, and DocumentCloud and Investigative Reporters & Editors

//     Underscore may be freely distributed under the MIT license.

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