[TASK] Remove leftover FLOW3 code in Caching

The Caching Framework has still an Exception
related to the (now removed) class loading and some
methods which depend on FLOW3 caches and classes
which were never used.

Resolves: #71799
Releases: master
Change-Id: I2f3ffbc128bff217e8d4e02a22a8648893dc0b9f
Reviewed-on: https://review.typo3.org/44927


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>