[TASK] Respect the AsCommand `hidden` constructor argument

Symfony's AsCommand attribute encodes `hidden = true` into
a trailing `|` for the name attribute. Drop that for our
command list and mark the command as hidden in the command
registry.

Resolves: #102292
Related: #101567
Releases: main, 12.4
Change-Id: I6415e3f5525764aab336bab20432c032e0665632
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81617


Tested-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Chris Müller <typo3@krue.ml>