[TASK] Public GeneralUtility::xml2arrayProcess()

It can be beneficial to suppress caching using
xml2arrayProcess() directly instead of the cache
enabled wrapper xml2array() in some situations.

The patch makes the worker method public, adapts
tests to mock less and moves a data changing detail
from xml2array() to xml2arrayProcess().

Resolves: #94993
Releases: master, 10.4
Change-Id: I2b0347ebb1a293d2826b2d13b00f21b56568195c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70757


Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Daniel Siepmann <coding@daniel-siepmann.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Daniel Siepmann <coding@daniel-siepmann.de>
Reviewed-by: crell <larry@garfieldtech.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>