[TASK] Use SVG icon sprites

This patch updates @typo3/icons to version 2.x delivering icon sprites.
Using icon sprites greatly improves backend performance for several
reasons:

- A single sprite file contains multiple icons which need to be loaded
  once only
- The DOM is reduced as it's not necessary to load SVG icons inline
  anymore to apply styling

Todo for a later patch:

- Replace aliases with "real" icon identifiers

Resolves: #92689
Releases: master, 10.4
Change-Id: Ib3018c4e7f5471274e10c261438792b530c77cde
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66094


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>