[TASK] Have static DP in VariableProcessorTest

Resolves: #100393
Related: #100249
Releases: main
Change-Id: I039a5cc5e8473c7c9a4e6f2bced053a76358eb05
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78367


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>