[BUGFIX] Fix apc/apcu cache backend tests

bamboo php 7.2 has apc & apcu support again. Two
unit tests fail. These two however don't make much
sense in the first place since they md5(internal-knowledge).
Remove them.

Resolves: #85584
Releases: master
Change-Id: I5f1e1589189866508e684a7ca1bb6cae87d22fad
Reviewed-on: https://review.typo3.org/57621


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>