[TASK] Deprecate GeneralUtility::rmFromList

GeneralUtility::rmFromList is unused since v10. If at
all, this method would better belong to StringUtility.

Therefore, it's now deprecated in GeneralUtility, but
could be reimplemented in a more performant way in
StringUtility, when needed again.

Resolves: #94311
Releases: master
Change-Id: I2ea5ec57143d70fa2a0de2d2c34230764d3ce204
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69459


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>