Not globally setting backupGlobals=true speeds up
unit tests quite significantly. We can do this with
deprecated unit tests without further issues already.

Resolves: #104177
Releases: main
Change-Id: I4566b5113400563254041a35819ab34efa642313
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84831


Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>