[TASK] Move ext:adminpanel user TS out of ext:core

ext:core TsConfigTreeBuilder contains default
User TSconfig of the adminpanel extension.

This does not belong there. The patch extracts this
as "defaultUserTSconfig" to ext:adminpanel.

Resolves: #101791
Releases: main
Change-Id: Ifeac81e33f612976cb98b4b721d403ff72702100
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80750


Reviewed-by: Stefan B�rk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Stefan B�rk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>