[TASK] Replace `warning-in-use` icon with @typo3/icons overlay

The icon identified by `warning-in-use` is rendered when a record is
currently edited by another backend user. As one of the last remaining
bitmap icons, this should be replaced with an overlay from
`@typo3/icons` instead.

Resolves: #98128
Releases: main
Change-Id: Ifb9a37b835a97bccc7dfcc34a278d3c73e563817
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75424


Tested-by: core-ci <typo3@b13.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>